Hi-Ihave exactly the same thing - and it is indeed hard to believe you are not going potty, or perhaps a terrible hypochondriac!
What a bizarre symptom it is - feels like you have just eaten one of those mouth freshener strips - the ones that 'explode' the minty coldness in your mouth.
I have had it for a few weeks only - but plenty sick of it already - have felt quite nauseous/sick on occassion, tireder than usual and not 100% well - could it be a virus? although nausea could also point to acid reflux.
I am also very overweight,a number of years now, and have found it impossible to lose weight, rather i just keep on adding weight on! despite living on a terribly healthy diet of salad, veges, meat, fish, no cakes puddings etc, virtually gluten-free!? explain that one if you can. the weight thing also could point to acid reflus and diabetes.
Have you had any firmer diagnosis since putting up post? would love to know if you have.