In reply to your message I detail below:-
1. No medical problems and no medication being taken. 2. I experienced some heartburn before the tingly strange sensation started. I remember telling the SpR I worked with (iam the secretary) and he did a helicobacter test which was negative. No other symptom over the last 2 years. I told me dentist about it also and he could not help. 3. Yes producing enough saliva. 4. Feels the same but not enjoying the cold feeling now in my mouth and the roof of my mouth aches slightly. It is just a complete irritation and something I would like to solve. Thank you for your help.