Cold mouth sensation

When I eat dairy or gluten I get a cold sensation in my mouth. Like I've eaten toothpaste or breathed in sharply after chewing gum. It's in my nose to back of mouth and can stay for hours. I find lying down or having a hot bath helps it. Dr has absolutely no clue but it's consistent every time I especially eat anything dairy. No diarrhea or sickness just this sensation in my nose/mouth every time without fail. Please tell me someone else gets this i feel like I'm going mad!