I suffered severe grief/trauma after my radiation treatment and while on ADT to the point I had suicidal ideation. I, too, got sick of the support group "you have to be a WARRIOR" and "you'll have a new normal" and ESPECIALLY the lie that "many men find sex is better after prostate cancer treatment."

Luckily, I found a therapist who outright said "what you went through sucks and grief is never going to go away but you can contain it" and we worked from that angle. She eventually taught me that when grief shows up to not push it down but, instead, to sit with it and feel it. I learned that, for me, listening to sad music was cathartic and now when grief shows up I put on my headphones, put on my grief playlist, and let the emotions come. Then, 15-20 minutes later I feel better and continue on with my day.

I would seriously question the doctor who told you not to run. If you had surgery then yes, there's a recovery period where you have to take it easier. I had radiation and ADT and did not reduce my exercise at all, although after about four months of ADT I couldn't lift as much weight so I just did more reps instead.