My opinion is that you need to re-frame your relationship with your pain. It seems to me that the way you are portraying this pain at the moment, the main effect that it is having on you, is that it is stopping you from playing the piano. I can imagine why your husband might be getting sick of your complaints to him, because, in his thinking, if your pain is stopping you from playing the piano, then just don't play the piano anymore, and the problem is solved!
However, I notice that you've said that, even when you've stopped playing the piano for a week, the pain just kept happening. Even now, when you have the pain is entirely unrelated to whether you've played the piano or not. So, if you were to dispose of the piano entirely, your pain is likely to continue occurring. What other aspects of your life would your pain be likely to affect, with the piano hypothetically out of the picture? Would you be able to work effectively and earn an income, and continue to look after the family and the kids?
It seems to me that the piano-playing is just being framed as the most optional, arbitrary and disposable extra-curricular non-core activity that you are currently doing, so it becomes very easy to view the piano-playing as the trouble-making, dirt-digging disturber of public peace.
If you re-framed your relationship with your pain to leave your piano-playing entirely out of the picture, would you be able to say to your husband, "Hey Hubby Darling, my arm and wrist pain is so bad now that I'm worried how I'll be able to keep working and keeping the family together for very much longer."
I hope that if you re-framed your pain with the piano-playing out of the picture, then you might be able to look at it more objectively, address it more effectively, and gather your family and friends to support you more seriously.