In continuation with above advises, I would like to say that from history it appears more to be a TMJ
related pain and you must follow what you have been advised by the dentists.
In addiction to that I can advise you to take some warm fomentation around your TM joint and eat soft diet
If you are taking antihistamines, your nasal complaints must be settled.
If still the complaints persist, I would advise you to please consult the doctor in person and may be get some radio logical tests done for support.