Prostate pain after sessions

I’ve had my helix for a couple of years. All was well for the first year but then I started getting a dull pain in my prostate after using it. Not immediately after but if I sit down for a few hours or take a dump then I get a dull ache that lasts for a day or more.

I now limit the times I use it to once every couple of months and limit the sessions to one hour. Nonetheless I still get the pain. I’m thinking about quitting altogether as I’m worried about long term damage. Anyone else get this? Any possible solutions?

How do you breathe during a session?

The wiki suggests two types of breathing:

  1. Deep breathing to relax, which I think is consciously breathing into the lower chest

  2. 'Valley' breathing, to "stimulate the abdominal and pelvic areas". I've done a bit of research but can't quite understand what this is. Does anyone do it?

I've tried deep breathing during a session but found it a bit of a frustration because the consistent conscious effort took my concentration away from other sensations.

Does anyone else pay attention to breathing? What do you do?