Its okay to drop classes if its pertinent to your health. I know right now you feel low because you had to do it, but it says nothing about your intelligence and it doesnt make you less of a person. Do not be afraid to jump back in when you are ready. You can only succeed if your mind is well. If it became to stressful and you could not handle it, you may have done the right thing for the time being. But do not be afraid to jump back into school when your life calms down a bit.