The New England Patriots team mascot says he was REALLY hurt when he was unexpectedly tackled by NY Jets safety Jamal Adams at a Pro Bowl practice ... and is now dealing with pain in his neck and back.
It all went down on Wednesday in Orlando -- where Adams told fans he was "finna go knock this mascot out" before launching himself at the mascot, knocking the guy to the ground.
The man inside the costume sought medical attention after the incident -- and now Ian Rapoport says the guy is still "dealing with jaw, neck, and back soreness.