From the time I get up in the morning 'til I brush, floss, rinse (every night), I have a constant bitter or acrid taste in the back of my mouth. I haven't change medications, or added new ones. My diet is the same. No burping, or belching. I haven't lost or gained weight. Everything I eat and drink has a "weird" metallic taste. Citrus fruits seem to be the worst. Could someone please shed some light on this mystery for me? Thanks