Physically I'm right there with you. In 1973 when I was 23, I was diagnosed with Hodgkins Disease, lymph cancer. At that time they only used radiation treatments, and they blasted me with it. Over the years, the negative effects keep happening. First, it killed my thyroid and I've been on replacement ever since. It also killed all the hair follicles on the back of my neck. In the mid eighties it was discovered that the pain I was getting in my neck and shoulders was because the radiation damaged the nerves in and around my neck and spinal cord, which prevents the muscles around there from developing, to where in the last few years I can't hold up my head very well.
In the mid 90s, I got chest pains when I exerted myself, they found the coronary arteries that surround the heart were damaged by the radiation and scar tissue was causing excessive plaque buildup, so in 1996 I had open heart surgery to by-pass five arteries. in 2002 I was diagnosed with bladder cancer, which was also attributed to the radiation, but it was in the very early stages and it was cured.
In 2013 it was discovered that the radiation damaged my left and right carotid arteries in my neck and had stents put in both. A few months later they found that three of the heart by-pass grafts had closed and a fourth needed a stent, only two function now, which limits how much I can exert myself. in 2018, they found that two of the valves in my heart were damaged by the radiation and I had open heart surgery again to replace those. Plus while in the hospital, they found I needed a pacemaker and installed that. In preparation for the heart surgery, they accidentally left me on a saline I.V. for 10 hours, which bloated me and left me with high blood pressure and edema, having to take more medication.
In 2020, they found Squamous skin cancer on both sides of my neck caused by the radiation, which was thoroughly removed. In addition, in 2013, I finally had my right hip replaced from a car accident I had in 1977.
I too play sitting in a chair, and I can't carry my gear, so I use one of those old lady shopping carts to move it around, even setting it in front of me during a gig with mounts for my iPad and bass. My mental health is not adversely affected. I tend to be optimistic and positive and don't let any of the ailments hold me back, within reason. I know that attitude got me through all of it. I don't wallow in the circumstances, I move forward and enjoy myself as much as possible.