What is causing the bad taste in my mouth?

Patient : I have a bad taste in my mouth and my entire face feels hot, specifically my forehead and around my eyes, but I have no fever. Eating or drinking anything doesn't help. I also feel thirsty, but water doesn't help. After brushing my teeth, I discovered that the taste is similar to the aftertaste of brushing my teeth. I have had this before, but the bad taste didn't last as long and wasn't as bad. Does anybody know what is the cause of this?
Symptoms:  bad taste in mouth, thirsty, hot
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