I have followed a similar path. My issue was my back initially but am riddled with osteoarthritis in most joints. My path turned out to to retire because I could. The determining factor was I could not preform my job like I wanted to. Exploring disability sounds like a very wise option. I did have a spinal fusion which has been successful and am having surgical interventions on the bone on bone joints. One of the biggest lessons I have learned is to keep moving to the best of my ability. I know I haven’t answered you question but wanted you to know there is a ray of sunshine. Good luck