Oh my, this is the first time I got a message from your physical problems/situation, my friend.

I can empathize very well in your situation.
And I think that now you have a reason to be hopeful and optimistic.
Since I know several people that have had a hip replacement, and who now run "like a Kiviet" (lapwing) as we say here.
Unfortunately, I am very familiar with having no concentration and no sleep due to extreme pains.
So my situation, already is for years, so I can not really write and read here on RR as I would like to.
But that is irrelevant, only to mention, I sympathize with you, Len.

I also hope you don't have to wait too long, and that you in the meanwhile, before this surgery, will be in a 'as good as can be' physical and relaxed condition.

Greetings and get well wishes, Mies.