Suddenly all food and drink taste vile

Patient: For the last 6-7 days everything I eat tastes and smells the same .. But not a nice taste/smell it’s horrible , almost like its all gone off. I can’t drink certain drinks either, diet coke and squash taste strongly of this horrible taste – so I am just having water now.This even includes when I brush my teeth – toothpaste smells and tastes disgusting lately.I haven’t changed my diet lately, I am not pregnant and nor can I see anything wrong with my mouth.Please help as it’s driving me crazy.

Symptoms: Bad taste in mouth