This turned out to be a symptom of kidney failure for me. I was previously told by my primary care physician that it was my sinuses. I also had leg cramps and shortness of breath which was brought on by anemia. I was anemic because my kidneys had stopped functioning and was no longer making red blood cells. I had no taste for any particular food and I was still making urine, but they were not filtering as they should. I am temporarily on dialysis, and if my kidneys don't resume working, I will be permanently on dialysis until I can't get a transplant.
If you have this this particular taste, have it checked out by a specialist.