I understand you, and am sorry you are having pain/trouble.
With the above said, you mentioned you recently had a cleaning at the Dentist. I am NOT saying that your problem is related, as I do not know, but it could be... Sometimes, after a cleaning, surrounding teeth, tissue, etc., is sore. And, it would certainly be possible. Definitely not for certain the cause of your trouble, but definitely possible for being the cause.
Since you have just had numerous x-rays, it sounds like no there is no extra tooth coming in (even though it "feels" that way to you). So, that should be ruled out.
Also, I should tell you that although I'm more inclined to think it is related to the recent cleaning & Dental exam, there are "some" things that science just can't explain.
Here is what I am saying, I do NOT know what specifically is wrong. My money would strongly be on the recent Dental cleaning & exam having inadvertently caused the problem however. And, the very best news, is whatever the problem - it should subside "at least slowly" and GO AWAY! I realize this does not help the discomfort her & now. But, given some time, over the future days or week, it is only plausible & expected that the pain which you are now having should go away!!! I hope this helps you Sir!
*NOTE: You could try some pain medication, such as 800 mg. Ibuprofen every 6 hours, for the short haul, if needed. And I'd EXPECT this problem to subside. If not I will be very surprised. And, I'd then see the Oral Surgeon, possibly for that biopsy he suggested, but I don't think it will come to that. Please hang in there...