:( Why won't my sickness go away?

Why you would go to the gym to do your calculus is beyond me, but that's neither here nor there. I suggest a heavy dose of fruits, vegetables, vitamins, and fluids. Get plenty of rest. If you have to study on your own in bed...so be it. You don't want to infect your study buddies. You may be able to call your instructor and postpone your exam due to illness. Maybe you could bring him or her a doctor's note as proof that you were ill. Good luck!