Terrible taste in mouth?

The past two days I have had an overwhelming bad taste in my mouth. It tastes like eupropean salt licorice for those of you who know it- for those that don't, black licorice and salt basically. I have been brushing my teeth nonstop and chewing mint flavored gum, etc, nothing is taking the taste away. It overpowers food, drink, everything. It's driving me crazy and I have no idea what is causing this. Anybody have any advice to get rid of it/what might be going on? I know it sounds silly but I'm starting to get a little concerned. Not sure if I should see a doctor or not.