Same thing here. The bad taste has been evolving and today for the first time it tastes like blood. I haven't spit up any blood, but the taste is awful. I have a problem with excessive mucous and it sort of tastes like it could be a mucous taste as well. I have to do a lot of loogie hocking and I get all kinds of colors from clear to brown. Please let me know if you figure anything out.
P.S. You didn't drink or eat anything red did you?