What do you do when your mis-diagnosed with a mental illness?

I had a little hiccup in university and I gave up on the system…I started lying and I stopped being happy. I failed out of university and I took it personally… so I refused to pay my student loans and I eventually refused to work because I found out that they would garnish my wages… I moved back home and fell into a mild depression and stopped eating and sleeping regularly… I lost a lot of weight and I was out of my mind with mental and physical exhaustion…I eventually asked a outreach worker for help and she broke my confidence and sent me to an emergency room and blabbed everything I had told her about being angry at the world…I was wrongly diagnosed with a mental illness seeing I was not taking care of myself and had anger and grief issues…
I still think I have something useful to contribute to society…but the medication I’m on makes me extremely sleepy and I vomit frequently… I want off the medication and I’m told that I have to stay on it for life…I’m limited in my occupational options seeing I don’t have a completed degree… I’m really embarrassed about my situation and I have thoughts of running away from home and starting fresh in a new community, but my family needs my disability payments to survive, and I can’t just leave.
What are my options? What would you do? If I stop taking medication I can lose my disability payments and I get horrible side-effects.