Medical advise Male problem HELP?

I recently had to get tested for...any problems in my prostate. They stuck a catheter up my...you know. I didn't get any pain relief so it hurt really bad. I don't have anything wrong there, so I went home. But it didn't take the numbing gel they offer because they would have to go up there again. It was in the morning and it still hurts. They said it would but would stop eventually. But I just want to know if there's anything I can do to make it hurt less. Some guy said masturbate but I want to check if that wont cause pain. I just want to be very clear on my situation. That's why Im asking. Thanks for any help,