If pain is associated with flossing, periodontal evaluation is advised. Symptomatology of temporomandibular disorder is not limited to joint pain itself. Headache, neck and upper shoulder pain, ear tinnitus , stuffy ear, tooth mobility, tooth sensitivy to cold or hot, tmj and orofacial pain, supraorbital pain, are related to tmd.
The other symptom I have is a lot of pain when flossing in the area in question which then reffers a headache. I do not have any jaw discomfort. It just seems so obvious that is is dental related but it is very frustrating to say the least.
It appears your pain is referred pain from muscular origin based on the imformation provided. Dental origin is not likely. Sinus pathology needs to be ruled out by ENT doctor. If no sinus pathlogy identified, seeing a tmj specialist is advised.