Stomach pain after eating

Desperately seeking an answer for my 16yo daughter. She first began having severe stomach pain in NOV 2009 that took us to the ER. They ruled out appendicitis or gall bladder attack by x-ray. She had a mucous-y stool so they prescribed a stool softener for constipation & sent us home. She DOES NOT have bowel problems. She is mostly regular and eats a healthier veggie diet than most teens. However, after EVERY meal, she has stomach pain within about 20-30 minutes after her meal. Sometimes she is to the point of being doubled over. Her quality of life is being greatly affected. She cannot ride bikes, run, do aerobics, etc. because stomach will hurt. It is always tender, and sometimes bloated to the point that even I notice it is not normal size. Our D.C. is treating her with a virus 'potion', but has not been very effective yet. She still has a good appetite and is not losing weight. She is, however, very tired with no energy. She will get up to do dishes or clean her room and has to take frequent breaks to sit and rest. I just want her to be a normal healthy teenager again. I would appreciate any input. TY! Tweet