Arm pain whenever prostating

Sorry if this has been covered but I couldn't see any information or related topics.

Whenever I have prostate play or anal, my right arm has what I can only describe as severe 'tennis elbow'?

It feels like blood isn't flowing through it properly and is quite discomforting and painful.

At first I thought it was because I sit at a desk all day and use a mouse/keyboard, so it could have been carpel tunnel or whatever they call RSI related to mouse usage. But I noticed that it would go away unexplainably so it couldn't have been mouse use if I am still using it frequently.

I eventually realized the pain only came after my prostate was stimulated.

I'd just like to hear if anyone else has ever experienced this or something similar or if anyone could think of any reasons for this to occur?

One thought was that I'm lying on my arm improperly for too long but it's always the right arm, and sometimes I lie on my left.

Cheers