How can I stop a tooth ach sharp pain with feeling very light headed very sencetive to hot and cold and his gums are very score ans sentive it even keeps him from sleeping cuz it herts him so bad

This . This question should not just be about stopping your pain. It should also be about finding the source of your pain so that it can be addressed. Your problem may become much more serious if it goes untreated. Please see your dentist as soon as possible.
See a dentist. You can't treat this problem at home. Tooth either needs root canal therapy or needs to be extracted if it hurts as much as you say. The longer you wait the worse the situation will get. And in the end, the result will be the same... You will go to see a dentist.