Shipwreck - in a ten year shame spiral ready to reinvent one more time1

New here, not new to diet/ exercise/ mental preparedness/ and healthy choices! Retired Physical Educator.
Sat down for ten years after a
Life of physical fitness and enjoyment.
Now, I can barely walk.
My knees are blown out. I weigh 360 at 5’10”. I’m in such an atrophied state I have to plan my walk to the mailbox. It hurts so bad. When I get back to my recliner I’m breathing like I just ripped 100 yards! It’s horrible!

But I’m not dead yet. Having Bariatric surgery next week. So I’ve already begun my pre-op nutrition plan.
Just want to connect with some people who can help me stay on my healthy choices course.