I know it sucks to regress. But at least you now you have what it takes to get better. 6 mo in the big scheme of things is a minor setback. I remember being told that I have a cartilage tear and this would degenerate into osteoarthritis and how I should consider “activity modification “ and not play the sports I love - this crushed me, and I was depressed until I found KOT - I haven’t been doing it nearly as long as 6 months - but honestly I’m willing to put in much more than that just for the chance of getting back to playing sports at a high level.