Does your TMJ ever flare up without the sinus problem at all?
Not always. I find that the sinus problems are worse when my TMJ flares up, but they are also present, although less frequently, during my TMJpain-free periods.
Does your sinus problems and TMJ flare at the same time always?
The only meds I'm on currently are the Vyvanse (50 mg) for ADHD, and Nuvaring. When my TMJ flares up, I manage it with over-the-counter ibuprofen (I'll usually take 4 200mg tablets) and a joint pain topical rub (I usually use the generic version of IcyHot). It doesn't get rid of all the pain, but it dulls it enough so that I can function.
I also frequently develop sinus headaches (about 3 or 4 times a week), which I'm pretty sure are related to the TMJ. Sometimes I don't take anything for those, but if they're bad enough, I'll take something. Lately, I've been using Advil Allergy Sinus, because my symptoms are relieved with only one tablet.
What medications are you taking right now?