Hiya
I get bloated sometimes, but find extra water sorts it out. I also suffer from very bad heartburn behind my breastbone. I don't think rennies or gaviscon is 'allowed' but I got my Dr to prescribe me a gastro-inhibiter which sorts this out. I've got a months supply, by which time it should have stopped (it did last time I did the diet).
Its important to treat heartburn because the acid can do damage to your tubes. Try peppermint tea - it does help. But if its really bad it might be worth speaking to your Dr about something to reduce your stomach acid.
HTH
xx