I have the same thing, getting sick at night at 7-8 pm at night. i went to a few doctors and they all said the same thing, that the problem is psychological. So i went to the psychiatrist (NOT psychologist) and he told me that the problem is... STRESS and lots of it so he gave me pills for it to keep me calmer. they do work and i do feel better, but because of the pain that i went through for a lot of time every single night until i realize the problem now i still fear of getting sick again and i do have veeery small pains on my stomach. its until i feel safer i guess. So if you do have that problem you must go to a psychiatrist asap to help you stop the pain.