I havent had to drop out of school but i have had to use the disability program to be late with my assignments and not be docked credit because it was too much pressure for me in my manic state to complete all the work on time. i think you are making a good decision. I know it is disappointing after working so hard to get through the sememster but ultimately your health has to come first and you know you best. if you are going to end up in the hospital, it just isnt worth it. take care.