I had cortisol injection years ago in shoulder. It was a bit sore, but later it felt like I had had a wrist block, which was painful wearing off. Never had a lot of bother since, thank goodnessI suffer from “ bad” shoulders and have tried EVERYTHING! Heat, cold, heat and then cold, acupuncture, TENS machine, deep tissue massage, Chinese wood oil, I smelt like a Christmas tree! Osteopath and Tramodol. But the only thing that helped was the cortisone injection my consultant gave me, it was incredibly painful and I nearly passed out but after two days the relief was just amazing. I hope you find the same relief because I know how incredibly painful and debilitating it can be. Good luck.