I have cotton mouth and drinking water hasn't helped. Could it be half the half pizza I ate?

So I am a little worried that I might be borderline to getting Type 2 Diabetes. In January, I went to the doctor and he asked me a series of questions and than said I don't have diabetes. At the time, I was eating really bad and lots of coffee everyday and sweets such as cookies and pastries. My mouth started to get super dry and drinking lots of water never helped. As a result, I would go to the bathroom every 15-20 mins until the water I drank got all flushed out. Since than I've been trying to watch what I eat. Staying away from too much sugar and pretty much cut my coffee consumption by half. The dry mouth eventually went away after 2 weeks. Fast forward to present day, I woke up this morning with a dry cotton mouth. My mouth hasn't been this dry since January. Looking back at what I ate yesterday, I'd say that my sugar intake was the same it's always been since I reduced it. I had a piece of chocolate, an iced vanilla latte and a small piece of lemon tart from starbucks. The biggest change to what I had yesterday was that I ate half a pizza (about 4 slices) I made from home. I bought the ready made dough, sauce, cheese from Whole Foods. My question is could this half large pizza be the result of why my mouth is dry this morning? Or do you think it was the coffee and sweets? Like I said, I've been including a small piece of chocolate or some sort of sweet and a 12 oz of latte every once and a while and I haven't had this problem. So I am guessing its mainly the sugar in the pizza dough and sauce?