It probably is all related - -sounds like the muscles that operate your mouth aren't working properly right now.
The problem is, of course..once you bite your tongue, (or the inside of your cheek, a place I'm constantly biting) it becomes a bit swollen, so in the way even more. about the only "cure" is to be extra vigilant when you eat, and try hard to not bite it again until it heals. Chewing gum is probably NOT a good idea, as you tend to do that casually, without thought, and when the tongue is already sore, it'll get re-bit for sure.
If you're chewing gum because of a dry mouth, sucking on a hard candy (sugar free) might help.
...I am not a doctor, nor health professional, and don't pretend to be one, here.....