Hooray on finding #1 and being able to address it with surgery.

Any idea what the causes of #2 are? Just normal wear and tear, or something else?

Also, my understanding of your actual foot problems is that the main overpowering issue is severe pain when you walk or run. Other than the pain, everything works ok, right? You can walk, and run, just fine; it's just that you're like The Little Mermaid (of the Hans Christian Anderson story, not the animated movie) and every step you take with the feet that replaced your tail is like walking on knives.