I dropped many classes throughout my university career because I was overwhelmed with depression. I was seeing someone at the university counseling center though, so I had their help in making sure things got filed correctly. I would support fleur's suggestion to sell help from someone at school that would know the procedures. The Dean of students office is a good place to start to inquire about your enrollment status. They can then point you to other pertinent puerile our offices. Try to avoid giving to much info to any student workers there though, as they likely went have much info for you. If your school had a health services and offers mental health assistance, they would also be a good point of contact but likely will only serve you if you are currently a student. I went through a few semesters of having only one super easy class with a note from the therapist that it was all they felt I could safely handle. I went to school across the country from where I grew up, and it would have been detrimental for me not to continue living far away from home. My t agreed and helped me maintain enrollment at the bare minimum level so I could still see her and remain in state. I did this more than one semester, and the school was ok with it because they knew what was going on. I did lose some financial aid, but only that which was connected to being in a certain number of credit courses a semester. I was able to keep other financial aid and grants to help with the cost of school.
Just let them know what is going on. Often times they will bend over backwards to help you out as long add they are in the loop.