I'm sorry to say this but your dentist is an *****.! Before I was unemployed (a yr ago) I've worked in the dental field front & back for 8 yrs. the fact that your dentist is upset because you 'went over his head' & went to an endodontist is so ridiculous! Wow. So he won't treat the teeth now?
I didn't ck ur profile, but if your in the US, and you are a patient of record (which you are because you saw him recently) then call him up and let him know your in pain. Period. He MUSt see you, diagnose the pain and either treat it or refer you. He doesn't have to do some big restoration, just anything to save your tooth if possible and get you out of pain.
He has to see you though, or that is neglIgence on his part which can equal legal trouble for him.

I'm sorry you have such a crappy dentist ;(. I hope everything works out for you