Sooooooo frustrated!!! Opinions please...

Hi, I have been on here for awhile now...I typically just read what everyone has to say.  I use entries as a learning tool, as well as inspiration for myself on a daily basis.  Today though I'm very frustrated and am thinking am I going nuts...
Last night, at work, a job assignment came in which required me traveling 3hrs downstate to pick someone up...I was at first going to pass on it but thought, why not??? I typically stay inside the office now, because of all my blood thinners and meds I take.  So, I figured this would be a great opportunity to finally get out of the office. My immediate boss gave me the ok to do the run...It ran into some overtime as well.  I was very happy about it...I finally arrived back home at around 2am.  I missed some of my meds that I typically take at 8pm... I finally hit the sack at around 3am, after meds, shower, getting my thoughts together, asleep by 4am...I start work at 830am everyday but they knew I had gotten back late, so I figured I would get up by 9am and be at work by 10am...
Well, s$%^ starts as soon as I get into work...Apparently some of my fellow co-workers have a problem with the fact that I got the job.  That since I have "Medical Problems" that I should not be entitled to go out on a job as such.  They also wanted to know why I was at work late???
I'm so tired of the crap...Before I got sick I worked the field all the time and was good at what I do.  But since my last MI, I have been pushed back into the office because of the danger that my work presents to me...My boss pulls me aside and starts telling me all this crap and I'm like, huh???
My point is that I feel bad for being sick!!!  I have scar tissue on my heart, I have had 2 MI's , possible TIA's, meds three times a day, and not to mention the depression I'm constantly fighting with a daily basis...OH, I'm 37 yrs old as well.
It's like people look at me on the outside and think I should be ok...They have the damn answer to everything...There are times I don't even want to get out of bed, I can't sleep, at times I can't keep my eyes open for days on end, I feel like crap from the meds, I feel sad, I feel why me, I feel lost, and know that my career is permanently side tracked,  I can barely function at times...There are times where I feel good but that window is short lived...And when I hear people talk negative or why I do this or that, I wanna just donkey punch them...
Sorry for ranting, just tired of this all...Gettin tired of being around...
Thanks for listen..
Sincerely,
Tired...