Is It Safe To Have Nexium And Tazac For Cough Caused By Reflux?

I have had a persistent cough for about 18 months to two years. I have had asthma tests, oxygen respiratory test, endoscopy. I have been told I have slight hernia at the base of osephagus which causes reflux which causes the cough. I take NEXIUM and TAZAC but the cough has never improved. Should I see a specialist pulmonologist doctor? regards Lorraine McGuire