i have the roof of my mouth and the top of my tongue that feel raw, or like you would drank hot coffee and burnt your mouth,it been like this for several week, i have ask my health doctor about it, my heart doctor, but no help, i have also been haveing gastro problem, acid reflux real bad, had them go down with light twice too look around, have done a smart pill test, bravo test twice, and they have done nothing to help . i am takeing zofram for nausea, which i stay like that all the time,zantax 300 mg. and protonix 40mg twice a day. none off this has helped,i ask to see another doctor to see if they can help, this all has been going on for months now. thank you.
His you mentioned you might have HERD in which the food will regurgitate after swallowing. Coming to your problem that is rawness of your mouth you did not mentioned your adverse habits like taking nicotine or tobacco in any form might be the reason. Most of the issues you have mentioned will appear due to hyper keratitis or fibrosis or humanization of oral mucous membranes. Moreover, you are on so many Chat Doctor.  So you need complete oral examination form an oral medicine specialist. Plz visit your oral medicine specialist and gastroenterologist as well. Hope this is useful. Even acids that coming into your mouth also might be the cause.