Hello, As you are on doxycycline for a sinus infection. Causes for ear pain and jaw pain are:- 1) Referral pain of a sinus infection 2) Injury 3) Tooth infection 4) Ear wax 5) Ear infection 6) Otitis externa You can use Otobiotic nasal drops. Do steam inhalation three to four times a day. Treatment depends upon underlying condition. Kindly follow with detailed history or consult with ENT surgeon. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Shyam B. Kale