Chiming in to say that I agree with Blacksheep. It's better to withdraw and not mess up your gpa than go to class and hope for the best. In the past I would just stick it out because I felt a lot of shame around withdrawing (which is DUMB, if you are ill, you're ill. No shame in that). However I did end up taking a break last semester when I realised the thing about the gpa, I never knew that if you withdrew from a class that it wouldn't affect your gpa, I thought failing it was the same thing.