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HI. Welcome to JA. So if pivoting is bad, the most common problem is the TFCC, The triangular fibrocartilage complex. I will attach a webpage on this problem. Do you have an MRI report? If you do, just upload it minus your name, as this is a public forum, and I can explain the findings to you.
As you have been swinging a heavy hammer for 40 years, it is possible you have chondromalacia, or an endochondral lesion, a breakdown of the bone under the cartilage. Hard to say from here. Please get back to me to discuss this further, ask questions and I will answer them. Or if satisfied, please remember to rate this service by clicking on the rating stars, as that is how I am compensated for this work thanks *****