I second the suggestion about playing with others.
If you are fortunate to have a group of like-minded ukers available for
regular or irregular get-togethers, take advantage of that. They can
pull you out of your funk if you will simply be there with them. Their
enthusiasm can be contagious, as yours will be to them when they are
down, a self-pertetuating cycle of mutual inspiration and encouragement!
These UU conversations might also get you hungry again.
I might also suggest reviewing some youtube videos, not the ones that
make you feel worthless, but maybe someone who is just excited to share
their excitement with the rest of the world! Maybe something completely
UN-ukulele related.
It's good to have your own songbook made up of your favorites. I find myself
thumbing through old familiar songs that may not thrill me as before, but soon
I find one I just can't help smiling to. It's good therapy, a little dose at a time.