Right side of face, jaw, teeth, gums hurt horribly. plus, coughing, sinus pain/pressure and headaches. is this sinusitis? happens 2 weeks at a time.

Possibly: Best to get a Dr to look at it, especially with the spread of symptoms you describe. Antibiotics might be in order

Very possible: Generalized dental pain secondary to sinusitis is very common. If decongestants make an immediate difference then its likely your sinuses. A tooth that has become a chronic problem can also refer pain elsewhere but the global issues and the cough are not usually associated with dental issues

2 separate problems: These 2 problems should be addressed separately. 1. swollen gums - can be a sign that you already have, gum disease or dental abscess. See your dentist. 2. Headache, sinus aches, coughing- seasonal flu is very common viral infection with symptoms you have described. Usually the condition resolves on its own with home care. Drink water, NSAIDs and get a good rest. NSAID.

Can be : sinus,dental or both, so see doctor and dentist for an evaluation.