Glad you are doing better. And yes it's hard and you can't do certain things, which sucks, but we have to look at the positive things that surround us because life is short and very precious, so we have to enjoy every single day giving our best.
I totaly agree with you, that most of us don't really appreciate our health or life and instead, we just like to complain about everything especially what we don't have. Till we lose something, like our health or someone or in your case the ability to run or work or our vision etc. then we realize how much we need all these things in our lives. We need to pay way more attention to our health and this is what they should teach in schools because that is so precious and really the most important thing in our lives. I try to teach people to take care of their health NOW because that is their future.