I started off with rennies and gaviscon. Mines now got so bad that gaviscon doesn't touch it and I'm on a prescription medicine from my mw. Still doesn't prevent it, but helps ease it. Still munching rennies throughout the day. It can't really be avoided completely, lay of spicy foods, caffeine/fizzy drinks can aggravate it, milk/yoghurts can help. I find I get it no matter what though.