Rotten egg taste draining from my sinuses?

Infection.: Sinus infection case cause foul tasting drainage. If not part of a simple cold, or if it persists, see your doctor.

Infection: A foul tasting odor from the back of your throat could easily be an infected sinus. I'd see your physician for an evaluation. Most times an antibiotic can help this. If it's more chronic, i'd see an otolaryngologist.

See below: This is a problem that requires a face-to-face meeting with your doctor. In that meeting, your doctor will listen to you, perform a throrough examination and possibly order labs or other tests. Based on this information, he/she will be able to tell you what's wrong and what to do about it.