hi i've been like that for years, but i smell garbage. It is the sinus, it could last three m onths, it is the start of not feel good for a while. keep sinus moist get some nasonex from your dr. , it get's worst you gag from the flem, you nit throw up in the morning , and lots of headackes. good luck i've been like this for 10 years spring and fall, could also so the sinus rince, or the sinus teapot. no dr.