Heya Nicola,
My name is Shannon and I’m 15, don’t worry about the heartburn/reflux it is just all part of being a tof. I was on over 40mg of omeprazole but now my reflux/heartburn is barely there. It really does get better and of course there will be rough patches, there is no point lying about it, but it won’t be bad all of the time. If the gaviscon isn’t working effectively you might want to try peptac, personally I find it a wee bit better.
Don’t know if that helps or if you want to ask anything else just e-mail me. I really hope your son is doing well and that the hearburn/reflux eases up.
Shannon