Hi thanks for contacting health care magic... Here you have mostly headache from left ear as a reffered headache .... Rule out left ear infection like otitis media or labyrinthitis .... Otoscopy and other required investigation done for it ... If infection present antibiotic ear drop and oral antibiotic course might needed. If congestion felt more then antihistaminic drug can be taken.... If you have lacrimation and conjunctival injection like autonomic symptoms and short lasting unilateral headache repeated then there might be trigeminal autonomic cephalalgias ...for which while headache sumatriptan might given... But it is suspected lastly if no imrovement with decongestent . For headache analgesic can taken. Drink hot water... Take care Consult ENT surgeon for your condition.