Why have I become extremely sensitive to sour candy over the years?

19 FTM 5'4 take adderall (25mg), lamotrigine (150mg), and prozac (40mg) all daily. I have POTS. No recreational drugs/drinking/smoking

When I was a lot younger I used to love sour candy (sour patch kids, sour skittles, etc.), obviously if I had way too much my mouth would hurt but I could eat a lot and be fine. Over the past few years sour candy seems to damage my mouth way more. If I ate a single sour patch kid or sour skittle my mouth would feel painful for hours. Even eating one thing of fun dip is now enough to do that. If I had more sour candy than that I would be in extreme pain from my mouth burning. I miss sour candy, wtf is wrong with my mouth?