You sound very much like me several months ago. I didn’t recognize myself as I was sad all the time. Realizing the things I have given up to this disease. There is hope. I am now completely off of prednisone and the depression is lifting. I am extremely cautious about my activity, but feel I can start doing gentle exercise.

I would advise you go back to creating your form of art. Gardening is particularly difficult on the shoulders. Do what brings you joy. This disease takes away too much of us. Return to what you love if possible.
I am slowly starting to do the things that bring me joy and the fog of depression has started to lift. Praying I don’t relapse, but enjoying what is in front of me right now. Good luck.