Thanks girls for your replies and ideas!

Nat, I ate meat that night which I really haven't eaten much of this pregnancy, so that probably explains why it got so bad.

I did an archive search here and saw that chelleg said at work they suggest trying fruit tingles. I thought there was no way that would work, but I had it all day yesterday (albeit not anywhere as bad as the previous night) and DP went and got my some fruit tingles with some quickeze for backup. I sucked on three fruit tingles through the day and it really worked! I had no heart burn last night, even though I ate stew for tea.

I'll definately try mylanta next time I think, there were just no chemists open the last couple of days, I'm very excited these fruit tingles seem to work for now.