Most colleges have new student associations or mandatory class that introduces you to student life, help you find the right major, gives tips on how to study, and general info about n how to succeed. You might want to start with one class to see how you handle the classroom environment since it was so hard last time. I think the standard thinking is 2-3 study hours for each credit. One ave class at 3 credits means 6-9 hours of study time outside of class. If you take one class you can find out how long you need for study and plan accordingly. It also gives you more down time to hang around campus and learn your way around.

If it's too much stress in a regular class you might think about online classes. You can also meet with counsels and take aptitude tests to see what matches your strengths, not personality test but tests of your aptitude they a bit more functional and realistic than the personality career tests. You can also talk to your doctors and therapists to find out what is realistic for you.