Don't stress yourself over things you have no control over, that will only leave you feeling worse. Concentrate on resting and getting better so that you can be well enough for exams.^^
Sometimes in life, no matter how hard we try, it seems like nothing is ever good enough. But if you don't try at all, then that's when things stop seeming not good enough and become not good enough. So never give up. You may think nothing is ever "good enough" for someone, but there's always gonna be someone that knows everything you do far exceeds good enough.
Depressed or cheerful, tomorrow always come, so cheer up and forget about your worries. Hope you get better soon~!