I too a stage 4 er (psa856)started with hormones ( lupron and Xtandi) which I’m still taking. Was effective for 9to10. Mos—kept psa in normal range , then went to 86—added a round of chemotherapy—psa been holding about 11—have started round of nuclear therapy.psa still holding. And yes for me to is a scary situation. I try to be grateful for today, hang tight with friends and family, lean on spiritual well-being. Wishing you all the very best.