Pain on roof of mouth during fast?

I’ve seen lots of people talk about pain on the roof of their mouth when breaking a fast, but mine is currently happening, and it’s making me want to quit it! It’s been going on two days, and i am currently on day 7 of fasting. I was hoping for at least 14 days, but i don’t think if i can handle this for that long 😅 Does anyone have any explanation, maybe involving ph balance or such? I have gargled salt water, taken two throat lozenges, and i have chewed gum during the fast, otherwise it has been a water fast.