Do I have a sinus infection?

I had the flu two weeks ago, and never fully got over if, however the past two days have been horrible, I have been non stop blowing my nose (I am going through at least a box of tissues a day!) I will wake up multiple times during the night to blow my nose. Case in point, I am very congested! I get sinus infections a lot! (I've had 5 this year) so I am just curious if you think I have another one. There is one thing though that I don't normally get which is a horrible toothache, it is now causing my left jaw to not be able to open all the way, and I can't chew on that side of my mouth. I do have TMJ but this is not TMJ. The toothache started the same day I became congested, so I'm wondering if they are connected????? Thanks! And sorry for all the detail haha.