Acid reflux

Never had it before, I have a stomach like a horse. Actually, better than a horse, since I can eat and drink just about anything without consequences. Last two days however I have constant burning in my chest, sort of. I've been in one circle, eat at different times, not the most sensible food either (whatever's at hand at the moment) - so it is entirely my fault. That's not likely to change within next two weeks. I have rehearsals every night and often have nothing but junk food and coffee to resort to. I will try to bring a wrap or whatnot, and eat somewhat regularly.
In the meantime, is there any natural, non- medicinal, way how to ease the symptoms? It's driving me up the wall. Ironically enough coffee seems to help a bit, but then my heart is racing and my side hurts Yep, am in a bad shape. Need to take a nap. But but but is there anything miraculous I can eat or drink that would help? I don't want to resort to those syrups or pills, if I don't have to.