Ive had both heartburn and acid reflux for ages now, and have got loads of gaviscon on prescription - I hated it too to begin with, and gagged whenever I had the liquid - now I just drink it from the bottle!
The tablets I cant chew, but I do suck on them (with a bottle of water handy). I find I wake up a few times in the night and have to take the liquid stuff - its just horrible. I've also woken up quite a few times gagging on my own vomit (well, the acid just sort of creeps up my throat!).
Im just relying on the fact that it will go after bubs is born - but it does make sleep very difficult. I also find that drinking milk helps, and steering clear of fizzy drinks or anything acidy like orange juice.