Sinus Issues After Not Smoking

Ive drastically cut back from smoking marijuana for two years to the point where I dont take it at all anymore except for a dropper. My face was having such congestion from the marijuana smoke. Now its been a few weeks and my sinuses keep draining into my mouth and I have to spit out what is draining and it feels like the sinus pressure is leaving but it wont quit draining and it has different textures and colors in it. Has anyone else experienced this and how do we treat that ? Its so uncomfortable.
Can't say as I have ever heard of such a thing. I would suggest going to the doctor.