COULD MY PROBLEMS BE OMEPRAZOLE

I recently had bronchitis in September. since then my problems have started. I have been on 10mg of omeprazole to counter act any side affects of anklyosing spondylitis. Following bronchitis l took sever upper abdominal pain coming from round the back to my middle stomach, indigestion - dr upped my omperazole to 2 x 20mg a day one morning and one night. sent for endoscopy as l have no gallbladder and all was clear. he has kept me on omeprazole dosebut have severe upper abdo pain, dizziness, pains in legs and generally feel yuk with nausea. has anyone else had similar as l am despairing and mind running riot for terminal disease! thank you