Overactive bladder maybe? See a Dr. Take care, there are meds for this stuff.

It could also be the result of a urethral stricture, which I like a small kink in the tube that runs from your bladder through your penis. Sctrictures can cause urine retention and the kind of leakage you describe.

If you ever have a weak or split stream or have been prone to utis in the past that could be an indicator of a stricture. If you suspect that it is a stricture, get your primary care physician to refer you to a urologist. They have several tests that can give them a better idea of what it going on.