So a few years ago I was looking into it heavily and found a blog about the same thing, mine are usually at the back of my mouth near where the jaw and skull comes together.. know where I mean? Just behind the top molars are. I can feel them almost immediately after I start eating. Pop easily, leaves a bump at the site for a day but releases that annoying pressure/slight pain.

Anyways, my doc said that it sounded about right and to keep a log to pinpoint what it could be.. I find that it is mostly processed meats but not always. There's my two cents, hope it helps.