question: Had root canal on last molar 12 days ago - 1.5 hrs. in chair with mouth open - TMJ flaired up and now have trismus.  Cant open mouth more than 1 finger - cant chew - headache and earache all the time - cant even brush teeth.  Hurts to chew anything at all.  Am losing weight from not eating.  Endodontist said there was no infection in the tooth he did the root canal on, but regular dentist prescribed antibiotic and muscle relaxer -- both of which make me nauseous, and make headache worse, and give me diarhrrea without helping at all with the pain. Am doing cold compresses every 15 min. and exercising jaw as much as I can.  How long will I have to go on like this and what more can I do.  I cant get crown on root canal tooth until I can open my mouth.  I also have bruxism.