Foxtrot, I can only add my belief that we all dislike the uncertainty of tomorrow in our lives. In your situation you are saddled with an abundance of that. Be rested in the thought that 'you will be here tommorow' with or without one of two testicles. Sometimes a way to minimize a concern is to shadow it with the perstective of a larger possibility. What if it was a kidney, eye, arm you get the drift. If there is cancer and they get it, be thankful. If there isn't cancer and you lose one nut to find out. Be thankful, because there was no cancer. You will have a normal life and time will reveal the lack of importance one out of two testacles really has in life. Back up, re-focus on the future and the present will soon be past.
God bless and release you of all fear.