Stomach Pain after eating anything.

My friend is suffering from stomach pain since last 1 month. Whenever she eats any solid things, she used to feel stomach pain. As she stays away from home, she usually eat outside food. Stomach pain is there since last 1 year but not for long duration like this. Previously within 4-5 days it used to get recovered with penta 40 tablet or isabgol syrup. This time it lasted more, so she visited gastroenterologist for check-up. Doctor has asked few tests to perform including liver function but all results came as normal. He has given some medicines. She started eating home made food for last 2 weeks but she still suffers with stomach pain sometimes and has to visit toilet frequently, most of the time after eating meals. It would be appreciated if you can help/guide us on this situation.