Why does my stomach cramp everytime after eating. upper gi endoscopy was normal. ?

Many possibilities: There are many possibilities. Are you allergic to dairy? Sometimes this allergy can develop later on in life. Have you been on recent antibiotics? Try to keep a food diary and if you're strict about it you may find that certain foods aggravate your stomach and should be avoided. How long has this problem been going on? Have you altered your diet or are you sensitive to gluten?