Welcome to the Back Board
Sorry your having back pain is what led you here.
You need to see a spine specialist and get checked out. Or at the very least your primary Dr (he can order x-rays or other studies) sounds like it's been a while since your DDD was 1st diagnosed? Is your regular Dr who is testing you for a vascular disorder?
If your disc is (was) degenerated enough to be causing ocasionally "touching" of the vertabrae, then it's highly likely that is what could be the culprit. It is also just as possible you could have further degeneration of that disc...and perhaps other discs are degenerated to some degree too?
I agree with what you've already admitted Football probably wasn't your best move
at any rate I am glad you've been able to stay athletic and active, the PS2 dancing game sounds really fun!
Again, we're glad your here & please keep us posted ~