I'll second @trusam1 's comment about chasing what-if's.

I didn't have a RP because by the time it was diagnosed my cancer had already "escaped" into my spine, but I did have spinal surgery and radiation to both the prostate and the secondary tumour.

For the first year afterwards every little ache or pain anywhere in my body made me worry there was a new tumour. My family doctor told me it's a normal reaction now, but she'll be concerned if I'm still doing that in 5 years.

This is traumatic stuff, both getting a cancer diagnosis and having life-altering surgery. You'll need to give yourself time, maybe months, maybe years to get used to it. You can never have a 100% guarantee that the cancer is gone, but I promise you that the worrying will get quieter over time, and the other parts of your life that you enjoy will get louder again.