I have not tried the probiotics you have mentioned but I was prescribed Nexium which made my condition much worse. As well increased acid and sore throat I developed bad stomach cramps and burning. As per advice in a previous post from Michele34 I have included juiced ginger into my diet. This has helped enormously. I couldn't take much of it neat and I'm sure your son wouldn't like to. I add it to juiced cucumber and sometimes celery. I don't know if this would help your son but it may be worth a try. I was really suffering and thought I would never get rid of it. Fingers crossed that I have now.