You got punched in the eye and now behind your pupil and above it is red what do you do?

If you mean the white part of your eye (the sclera) has become red, it's likely the doctor will do nothing and tell you to do the same, as the condition will heal over a short time. If you actually DO mean blood behind the pupil, in the vitreous humor, aqueous humor or on the retinal surface, the potential for serious, possibly permanent damage exists, and you should seek medical care immediately -- right now. You are reminded that advice from non-professionals over the internet is no substitute for professional medical advice.