It could be a sinus infection, just that. Great you are seeing your doctor. Ask about your new meds. I recently started something myself and noticed I tense my jaw almost constantly. I am pressing me teeth together and it is giving me a headache. I told my doctor and he moved my dosage around (taking half at one time of the day and half at another) to see if that would help relieve it. Not sure that works with all meds but definitely worth asking about.