In pain, am sick

Recently, everyone is falling ill. Well for me, I got this bum in my mouth which hurts like h**l and it really spoil my appetite. It's giving me fever too. My parents are giving comments like, " She always fall sick when exams nearing". I admit I do fall sick during exams periods but it's not even there and don't even understand how I feel. It's frustating especially when you are in pain and sick. My mouth just hurts like h**l.