CHRONIC STOMACH ACHE

My husband is having chronic stomache ache on lower left side of his stomach from the last 8 years.It started in his college time when he used to take lots of antibiotics daily for 3 years.He is Lactose intolerant also.He cannot eat anything in hurry or else the stomach condition becomes worse,that makes him think a lot before eating anything.He feels the problem of stomache ache almost daily from the last many years.Endoscopy ,urinary tests are all fine.doctor says everything is normal and well.Can anybody help.

[CalGal]

May I ask what condition would cause someone to take antibiotics for a 3 year period of time?