Hello. I recently founded a company with two friends, and we received seed funding. About two weeks paperwork was to be signed, we had a conversation about communication expectations (if others do not communicate, I tend to get worried and feel like I have to do the work in order for things to be okay).

Then I went home for Thanskgiving. Home is a bad place for me -- my parents tend to be hard on me, talking about me not doing enough work. Thanksgiving was particularly bad, and the communication problems on the team continued. I got really frustrated, and expressed my concerns. I did not receive communication back, and got really frustrated and left the company.

Returning to school, I soon realized I overreacted. I apologized and we agreed to work things out. I began taking Celexa (something I had not done before because I thought therapy was working, plus using insurance causes more friction with my parents). Two weeks later, the other two people said they were not comfortable signing papers with me involved, because they were not confident that I could be okay, so they removed me from the company.

I feel incredibly stupid for not starting the medication sooner -- it has cost me a lot, including this startup, a fallback job (that I had given up in order to pursue the startup). I am humiliated in front of basically everyone I know professionally and as friends. But I am doing okay and have put a lot in place to make sure that things do not get bad again, and this just feels wrong.

Does anyone know what my options are here? Thank you!

I dont know how you stand legally, but if these people treated you this way, then it sounds like your better off without them.
Dont feel humiliated because of other peoples ignorance and certainly dont feel stupid. Anxiety shouldnt be seen as an embarassing problem - your only human and obviously more sensative than these guys you where dealing with.
Im a firm beliver in the old saying 'as one door closes another one opens', you are destined for better things.
Cut your losses and move on.
Best of luck to you.
Linds