I used to have sinus too but I don’t anymore. One of the Chinese way of curing sinus is actually to boil a bat (animal bat, not baseball bat) and drink the water (or eat the bat. I can’t remember which but they’re equally bad I think). Not that I tried that but an aunt of mine did. I think it helped.
It will also be a good idea to check out a part of yoga practice called Jala Neti. It’s a bit like doing the bulb syringe thing but it’s healthier I think. I had to do this back in India during my yoga teacher training. Cleaned my nose like magic!
Hope you’re feeling way way better now! :)