You really should be evaluated by a urologist. While it doesn't sound like TC, what you're describing is certainly not a normal condition. It could be related to your injury; there are also certain viruses that attack the testicular tissue. Although rare due to vaccination, mumps is a good example of this. As Dianne said, it definitely pays to see an expert.
Right I/O 4/22/1988
Left I/O 9/17/2003
Tho' much is taken, much abides; and though we are not now that strength which in old days moved earth and heaven; that which we are, we are; one equal temper of heroic hearts, made weak by time and fate, but strong in will; to strive, to seek, to find, and not to yield.