forget the blood test and go to a psychologist. you can ask about that what ever thing you want blood tests for from the psychologist so that he can laugh at you.
also one really important thing about all this is that you start to take better care physically for yourself if you already dont. do some yoga, go jogging or what ever. if you are physically in bad shape, it will reflect on your psyche because your brains are part of your body and if your body isnt functioning properly, it will show on how your brains work. sleep is also really important thing, but good sleep comes when you get some exercise.