I am suffering from root canal trouble ( abscess on the nerve etc ) have been for the last 12 months so I know some of wat your going through. I would get to a dr ( at least) and go on antibiotics,they wont fix the problem completely but they will help. I am getting my tooth out , asap ( I know wat it s like wen u cant afford a dentist). The tmj symptoms have gotten worse since this started ( duh me just workin that out) .
Heres hoping havin the tooth out at least helps.
Its impossible to function wen your face etc hurts.. I have found ibuprofen works the best , ( be careful with it though its not a long term thing).