Constant headache from 2 weeks. Consult.

Hello, Around 3 weeks back, I started getting little headache at thr back of the head and at the jaw area. I consulted a ENT and she told its TMJ arthritis and suggested some tablets fr 1 week. After taking tat tablet, pain in jaw area is reduced but my headache is constant from the point I get up in thr morning till night (it's mild headache with a little bit of guiddines and nausea sometime) ,I consulted another doc and he gave me the tablets which are related to migraine. I see no difference with tht also, Last week another doc told me to get the x-ray and he told me it's because of sinus and gave another set of tablets...I am taking the tablets...but the headache is still there( specially the headache is in the back head ) and it's not in a constant place it keeps on shifting. I am seriously very confused as what is happening and whom should I consult.