Hopefully the sinus specialist can resolve your pain. I know how frustrating it can be. My situation has changed a bit, after weeks with no pain I now have a frequent toothache at one tooth that has had multiple root canals. It's looking like the tooth may need to be removed and replaced with an implant. I have been reading about pain syndromes and found a great book called The Way Out which described neuroplastic pain, that really spoke to me. I got the audiobook version for free from the library. I'm told that pain signals from the brain are misfiring, sending signals of pain where there should be none. That makes some sense in my situation however it gets very confusing because I have had some teeth where the dentist found an infection after removing the tooth. That makes it unclear and murky to me as to the cause. Is it my brain sending incorrect signals or is it actual physical infection, or both? So confusing, frustrating, and exhausting. I wish you good health.