All happening at once

I feel overwhelmed.  Happy, sad, tired, energized, pulled in all sorts of directions, but at the same time like I have no idea where to go. Sunday, really hit me hard.  I was so angry with myself.  Why can I be so easy going and understanding with everyone else, yet so hard on myself?  We put my mother in law in a nursing home Friday (bitter sweet for me) I have been providing a majority of her care physically and emotionally for 15 years now (she is 85 soon to be 86).  I felt so much guilt when losing my mother at 63 and when I wore myself out taking care of them both for 8 months that the anger/resentment built up when I realized my husband has been using his mother to keep me here.  Now that she is in the nursing home he keeps making comments like "well, know you can come and go as you please"  I always could have!  

Sunday though, I had two papers for school due.  I had been working on posts all weekend, had one paper done Sunday at 12 went to print it, my printer was out of ink.  Then as I went to save it, my computer shut down do an update and did not save any of my changes.  I then spent so much time insisting that my computer "had to have it somewhere" that I kept searching the hard drive and did a system restore...nothing.  Finally at 6 I half ass did my other paper for my other class, took a break to eat for the first time at 9 p.m. then finished my paper at 1 submitting my first ever paper late by an hour.  Then went to bed.  When I woke up feeling so depressed because I still had not redone my first paper that I did not want to get out of bed, do the paper or go to work, I did anyway.  Then I was almost done with the paper, got a phone call and then an email about two offers for internship sites.  1 I have to fill out the application for, the other said they want me, I just need to do what ever is necessary on my end as far as my school is concerned.  The supervisor I spoke to said as far as the paper, it is one paper, it only shows that I am human and things happen.  I am going to have to be a little easier on myself.  Why is it so hard for me to do that?  Why do I feel so lousy inside and yet do see an upside?  Will there be hope for me to truly feel good about myself?  Am I destined to help others feel good about themselves and me feel crappy about myself or is it that things are just starting to happen all at once and I need to take a breath and get a grip?