I completely understand how you worry and we all want to compare ourselves with what we "used" to be; but we have to leave that mark; and set a new mark for ourselves. Like you, as symptoms began to take hold of different areas of my life, I was gently reminded by my mom that a year ago I was lying in a hospital with kidney failure and look at where I am now. A year ago I had suffered a mild heart attack....so my dear friend; I know all too well how you worry.
Everyone here has had to learn by trial and error about limitations, and as Saysusie recommended we all have something we can do...you will find that there are trade off's - enjoy every breath; celebrate every moment....and laugh a little everyday.
Hang in there and hold on Morpheus, we love you just as you are!!!!
"I believe that friends are quiet angels who lift us to our feet when our wings have trouble remembering how to fly." - unknown