I have had sinus issues and tinnitus for over a year now. It started with an ear infection. The doctor said it was eustachian tube dysfunction.
It's all linked, I guess, but I've also played music in rock band for eight years, so it could be a number of things. I find relaxation and clearing up sinuses with sinutab helps a bit.
I have tried all sorts, acupuncture, hypnotherapy, homeopath, nasal spray. Some give temporary relief but then the earache comes once in a while and the ringing gets louder. I wish you all the best in your quest. The main thing is to live each day as positively as you can and try keep busy to block it out.