What's the best way to get rid of heartburn?

I've tried Tums, chamomile tea (usually it works), alka seltzer, drinking water etc. etc but I still have this strong heartburn that's been bothering me for over 12 hours!!! & now I'm really tired & would like to sleep but the gnawing in my stomach & radiating heat in my chest won't let me! I don't know what else to try :/ (By the way, the cause of all of this was ORANGE JUICE)