Another update from the black sheep..

So, last night was HELL..
Early in the morning I went food shopping. Had about 3 hours of sleep. The day was pretty awesome and I was in an amazing mood. At about 10:00 I was ready to go to bed which is unusual for me since lately I  am always up until 3 or 4AM. Watched my show and passed out. Felt great! That was until I jumped out of my sleep in pain..
At first I felt like I slept all night. Looked at the clock and realized it was only 12:00AM. Fuck. Didn't sleep long and I feel like I am going to puke. Chills, hot flashes, cramps, the works. I'm shivering. I jump up and run to the bathroom just to see that someone was in there. (BTW I have two brothers who practically LIVE in the bathroom, who are not considerate at ALL.) My younger brother works midnight shifts so I knew it had to be my older brother. AKA The pothead. I knocked lightly on the door to let him know that someone needed to use the bathroom. I went back to my room fighting the tears. I'm trying to relax, watch tv, stare at my phone, read DailyStrength updates, ANYTHING to get my mind off of the nausea and pain. A half hour later and this asshole is STILL not out of the bathroom. I started to lose patience. I ran to the door and started knocking louder. He yelled what in his usual nasty tone and I lost my shit and proceeded to tell him that I am going to throw up and get the fuck out of the bathroom.
Now before anyone gets the idea that I have overreacted let me clarify something. This happens ALL THE TIME. I live with probably the most INCONSIDERATE, selfish, rude, and lazy people on the planet. First of all, he is 27 years old, doesn't cook, doesn't clean, doesn't do his own laundry, doesn't clean up after himself, shit he won't even flush the damn toilet! He leaves notes for my Mom to wake him up or let her know he needs something cleaned. And he smokes pot EVERY NIGHT. He used to smoke outdoors, now because he thinks he is KING he smokes in his room which travels throughout the house. And when he uses the bathroom? He's in there for about an hour. If this was once in a blue I wouldn't care. But all the time? No..
So, anyways I ran back into my room and broke down hysterical. I am a baby when it comes to being sick, and I didn't understand why I got so sick all of a sudden when I was fine all day? I cheated on my diet which could have been a reason. Then I started thinking food poisoning. All I knew is that i wanted to sit in the bathroom in case I had to throw up but I couldn't because my scumbag brother was probably breaking up his pot in there. FML?
Finally he got out. He didn't let me know BTW. I had to walk out to check and he was in the kitchen probably getting his munchies ready. SO long story short I was up until about 6AM sick. In and out of the bathroom. Exhausted, drained, sick, and upset. Finally passed out before my sister got up for school. (BTW heard my brother's tv blasting all night and of course smelled the lovely scent of skunk which did WONDERS for my nausea..) <~~ Sarcasm btw. 
I woke up hours later. Pretty much slept the day way. Dragged myself in the kitchen to get some water where my sister and mother were. Told my sister that I was sick all night and she felt bad because she is awesome. When I spoke to my mother about it, she just gave me a look, and said "Yeah I know, I heard." and walked away. Seriously? I swear to you, ANYTIME I am sick.. ANYTIME.. everyone in the house except my sister acts like it's not a big deal or it's annoying to hear or talk about. Like it doesn't matter. I just don't get it.. Everything I do, everything I say, it's like a problem? The only person who doesn't give me shit is my sister. She is the only one who will sit with me, talk with me, make me feel better, or sympathize. And she is 10!! But GOD FORBID anyone else in this house is sick. It becomes the end of the world! They get pepto, ginger ale, medicine! The works!
I just don't get it...
I shop/buy my own food. I wash the dishes. I clean up after myself. I do my own laundry. I never ask for anything. I never make noise. I never have anyone come over. I keep to myself. I don't cause problems. Why do I always get treated like I am an inconvenience for them? Meanwhile, I have two brothers who don't do anything but make more work for everyone else? Who are not independent. I can go on for hours on what they do and don't do.
You should see when they order food.. They will ask everyone else except for me. Then I walk out of my room to get something to drink and see everyone hovered over the table separating their stuff. Maybe once or twice they are ordered the stuff and saw me pass by and replied with "Oh, you didn't want anything anyways right?"..
Besides the "home" I actually live in, this even happens with my father as well! He tells me to email/text him (because it's SOOOO hard to talk on the phone) so i do. He barely answers me. He will literally ignore my text messages and emails. But, if my brothers text him he will answer every time. We rarely see him, but if we do he takes us all out for about an hour. Usually for pizza.. And that whole time is spent talking to my brothers about shows they watch, and hockey. I usually spend most of my time staring at my phone because.. well.. I am not involved in their conversations. Most of the times one of my brothers are working he will cancel and figure out a day where both of them would be able to come. When I was working, he'd constantly pick them up on a day where I can't get out of work. He never made an effort.. Not once.. Not ever..
HA! Go figure.. Someone knocked on the door. Food was ordered.. 
What did I do to deserve this? What have I done so wrong?