I take 40 mg nexium (esomeprazole) a day for 7 years i am 29 i have a hiatal hernia he said its a safe drug he is a doc that handles these things is he right worried?

Yes and no...: No drug is perfect, & pros of long term use of acid blockade need to balance against cons (bone fractures, low magnesium, C.difficile infection). H2 blockers (tagamet, zantac, (ranitidine) pepcid) have been around since the late 70's, are safe, but may require increasing doses to achieve acid suppression. Proton pump inhibitors (ppi's) are also generally safe, but talk to your doc about lowest effective dose.