Need a couple of ideas and resources

I'm coming out of lurk-mode for a brief while. Mostly because I'm having
some issues with my son.
Before I proceed, I'll give a very brief history:
1) he's under the care of a psychiatrist for his meds
2) he's on meds (a cocktail really)
3) he's been in the hospital for certain behaviors that are concerning that
needed immediate attention and got immediate attention.
4) we have a social worker
5) we have a therapist (in-home psychologist who is helping me with both
parenting, coping and behavior modification skills for this kiddo)
6) I've learned safe restraint techniques for when he becomes violent (which
thankfully isn't all that often anymore)
7) he's on a behavior mod plan in school
8) he has a great IEP

So what am I missing? Why does this kid constantly tell people that he hates
living with me? This past weekend I was in the hospital.... very sick. I
have diverticulitis which I found out is aparently pretty rare in people
under the age of 30.... I'll be 29 on Sunday. My son threw a fit and told
some people at his school about how I left him alone with no one around. The
reality is that his step-dad who loves him very much took me to the hospital
where my friend met me and he took the kids home to care for them, knowing
that my friend was with me. He explained to my son on the way to the
hospital that mommy is sick and needs to be taken care of by special doctors
who can help mommy's tummy get better with special medicine that gets rid of
infection. I was gone only 3 days. I just don't get it.
Over Labor day weekend, I visited with my parents and when my son threw a
fit in the middle of a Wal Mart store, he had to be restrained until he was
calmed down... I actually asked the door greeter to call in a manager and
security guard to help me.... Are there resources out there that I may be
missing? Is this something that's just behavioral or was this something
resembling sort of like a seizure?
I'm coming out of lurk at the risk of being massively flamed and attacked.
What I'm actually doing is asking for help, ideas, resources, links and any
other ideas and advice anyone is willing to offer and share. I feel crappy
as it is. I really don't need anyone's cruel and judgemental remarks on top
of it right now. I'm also not looking for anyone to coddle me and say, "oh
you poor thing!" because I don't belive that I'm in any way burdened. I
believe I'm being challenged but have reached a bit of an obstacle that I'm
not sure how to get past.
Thanks.

--
"Many have forgotten this truth, but you must not forget it.
You remain responsible, forever, for what you have tamed."
~Antoine de Saint-Exupery