What Causes Palpitations Of Heart Along With Burning Sensation In Chest?

Hi, I am 44 yr old female, and lately I been feeling extra heart beats ( palpitations ) but at the same time I feel like a heart burn in the center of the chest. It goes away when my husband tap me on my back, but I get scare because sometimes the palpitations does not go away right away. I had an EKG and is always normal. An echocardiogram shows normal EF and the valves have normal function. I had an holter monitor and It did not capture any extra heart beats. I do not know what to think what it is causing the palpitations. I used to drink red wine and I totally stopped. Few months ago I was diagnosed with stomach ulcers and I was taking Nexium, I had an endoscopy and it showed 7 ulcers I was treated back then and I feel okay. I am just a little worry why I still feel the palpitations. I hope that eventhough I gave you a little bit of info this will give you an idea about my problem. Thank you.