I, too, had to take time off of college to get my bipolar treated. I didn't completely stop, I took classes at a local jr college that would transfer back to my university. I also took some that just pleased me and gave me some of those whatever course credits. You know the ones, you can take anything you want to fill in the blanks between your major and minor requirements. Taking these classes kept me in touch with studying and college in general, and I could take any number of courses, depending on my BP status.