This pain started during my masterbathing session 3-5mins after my first load going into my second round. i felt a sharp pain in my left ball.

Pain=signal: Your body tries to let you know when you exceed its limits. It also provides pain when the involved structures are infected or otherwise compromised. Either the pace of your self sex activities have created this issue or you have developed an infection of the prostate or other structures. If taking a break does not solve the problem in a day or 2 get in for an evaluation.