Stomach acid and pharyngeal pain

I have struggled with heartburn for quite some time. At first I would take rolaids when needed but I guess it just got progressively worse. I started using Prilosec OTC as it is cheap and plenty effective. Well this evening I had something new and frightening happen to me. My heartburn has always been the same, I get a slight warm feeling in my upper chest and I know to take rolaids to relieve this. (if I forget my prilosec). So tonight with no prior symptoms I suddenly burped and had a little acid come up, but this was not your usual bit of reflux... It set my throat on fire, It took my breath badly, I had to calm myself and breathe slowly through my nose. It was extremely painful and I took 4 rolaids, 2 swigs of pepto and drank milk to help. I'm going to see my Dr. asap but, I wanted to know what the internet could reveal. I've never experienced such a thing and it was horrible. Even after and hour It is still slightly painful to swallow. Its like i drank concentrated HCl.