Hi, So My Father Just Recent Fount Out That He

Hi, so my father just recent fount out that he has very high acidity. One of the main reasons why i'm writing in is because he feels like there is so much gas trapped in his tummy which is causing feeling of needles on the back of his neck and higher back area. He says that as soon as he passes gas the feeling of needles goes away and he feels much better. The longer the gas stays him he gets really bad anxiety! but the moment he passes gas or burps hes back to formal. We went to the specialist and they did a colon test and a gastro test. They tested the acid in his stomach and everything came back clean. we have complety changed his diet, are keeping him away from anything that is high in acid, oranges, tomatoes, lemons... you name it hes not eating it. (hopefully) His family doctor put him on nexium, zentec and dompredom. It seams to work but then hes back to how he in when the meds ware off. I just want to know if there is anything else that you may think of that might be better for him to do. Anything that he should stop taking, start taking or food related. I'm tired of seeing my dad is such a bad spot and i need some answers. I hope that you may be able to help.
Looking forward from hearing back from you
Sam.R