Need help for my stomach pain?

i have been ill for longe time more then 7 years and 4 years ago i went to see my doctor they gave me verity of medicine.seen that time utill now i have done many times gastoroscopy and colonoscopy.and doctor told me i have got ulcer and sometimes it gone and again it is coming back.when i eat the food it make me anxious and when i go to toilet i p the blood.and i am losing wait. and all doctor told me that i am to young to have ulcer.now i am dispointed from doctor.please help me what have to do now