So sorry to hear of your medical problems. I have had diabetes for 24 years and have various complications, including foot problems. I no longer shoot events, or anything that might have me on my feet for a long time. I picked up a Sony A6000 2 years ago in hopes of switching, but while the size was nice, the battery life, the AF and long exposure issues (more than 30 seconds) means I won't be switching any time soon. I have been slowly moving to lenses with IS built in though.

Almost 4 years ago I took a 10 day trip to Arizona and Colorado. I took nearly every lens & both Canon bodies I had at the time, along with a notebook. At the end of the trip, 80% of my photos used an UWA zoom and the other 20% were mostly from 2 other lenses. After that, I started to be smarter at what I bring, unless I am driving, usually picking 2-3 lenses and either camera body (Canon FF or A6000).

I also don't use the camera strap....from my event days I found using a hand strap was easier for quick movements, and I didn't have that huge weight on my neck.

I am attracted to the IBIS from Sony though and if they can get the long exposure issues corrected (I have a sky tracker), then I could see moving to Sony in the future.

Hope the pain can be managed and you begin to feel better soon!