The wonderful feelings will return at some point, regardless, they are part of us.
Depression is a far away place, many of us will have been there at some point. Hang on in there. Keep a log of your thoughts vs physical mood/state, good and bad and each time you have bad thoughts simply write them down and then think. what can I do right now to make this better. Often that is simply take a walk around the block and enjoy the fresh air. That worked for me. Now I climb real mountains. Good luck.