Ive had jaw pain for a couple of days, thought it was TMJ which was diagnosed about a year ago.  However, I now have a sore tongue that feels thick and as though it was burned, with some small blisters on it, also some blisters around my mouth, and I also have a sore throat.  Is this an infection, or could it be an allergy or an immune disorder?
Thanks for your query, I have gone through your query. The pain in the jaw could be because of the disc displacement in the TMJ. It can also occur secondary to impacted wisdom teeth or any infection from the other teeth. You need to consult an oral physician and take a radiograph to rule out the above-mentioned conditions. If it is TMJ disorder you can take proximal tablets, follow soft diet, do not open your jaw too wide. Give hot fomentation over the jaw joint. If it is tooth infection then you can take a course of antibiotics and analgesics like amoxicillin 500\u00a0mg and metronidazole 400\u00a0mg TID for 5 days (if you are not allergic). Then treat the tooth with root canal treatment or extraction of the tooth. The soreness and blisters over the tongue and mouth could be secondary to herpes virus infection. This is a self limiting conditions but for the pain you can take topical anesthetic and analgesics like Anabel gel. Do saline gargling. I hope my answer will help you, take care.