Right now I'm drinking diet pepsi at a restaurant and the acidity of the pepsi is hurting my tongue. Why?

I have never had problems with acidity on my tongue before but I am on a special diet and had lasanga today and also ate a lot of low carb junk food in the last 2 days.

Is the junk food the reason I have acidity on my tongue?

Or is it the diet?

Or is it the over indulgence on pepsi?
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