On one of my walks, I had the realization that if I were blind and suddenly re-gained my vision, I would be overwhelmed with joy and gratitude to be able to see these things. And yet it is not natural for the sighted to feel overwhelmed with joy and gratitude every time they open their eyes.
I try to practice gratitude daily; at first it was difficult to come up with things, but my perspective has since broadened. I am deeply grateful that I can see the way light filters through haze in late September. I can hear beautiful music (an unlimited supply, of anything I want, at any time!). I can run (to think, I used to consider this a burden!). I could go on listing things for hours.
You can experience joy in the good things in your life before the loss. Enjoy every sandwich - even the soggy ones.