I just finished a course of antibiotics for sinus infection, however i still have slight ear ache thick head and now a stiff jaw. i take somnil to help sleep and tried anti inflammatory meds but it doesn't help. what else can i try or is this serious?

Consult doctor: Don’t really know without speaking with you directly on a consult. Most sinus “infections” are viral or allergic and antibiotics are not helpful. Often respond to topical decongestants, steroids and/or antihistamines. Check with your doctor

Persistent symptoms: It would be prudent to see your Physician or a specialist ENT to determine if a second course antibiotics would be prescient. You should also see your Dentist or a specialist Oral Surgeon to be evaluated for TMJ dysfunction or impacted wisdom teeth. First diagnose the cause, that will dictate appropriate treatment. Indiscriminately throwing pills at symptoms, as you have seen, is ineffective.