Watcha hoolik,
I had RARP in Nov 23. It was a good 12-14 weeks before I was completely pain free. I'm still slightly swollen on my right pubic area. No pain.
You've just had major surgery. Your body is wondering what the flipping hell has just happened. Sit back & take it easy for a few months, and let things start to heal and knit together again.
What you are experiencing appears to be quite normal, from my experience, & also confirmed by other blokes I've spoken to who have had RARP. Good luck.