I'm feeling the same way right now, and I'm quite not sure why, other than being in a several-days-long depression.
It may be the weather and the season. You are only a few hours south of me (I'm in central coastal NJ) and have probably gotten hit hard by the recent storms.
I'm bipolar (type 2, hypomanic) and may be affected by the low levels of sunlight.
I know I am sick of winter; I am sick of the snow and ice. I don't want to go outside to do anything, like get in the truck to drive to work or errands!
I have my bass, my 2 acoustics, 6- and 12-strings, and my electric 6-string (I'm a guitardist also, or trying to become one

); plenty of material to play and practice; I have a 9+ year old gym membership (was powerlifting) I used last Sunday for the first time in 6 months. And I don't want to do any of it.
Sometimes when I get like this I want to pack up my gear in its cases and boxes, and my books and notebooks and put it all away. I don't have an eBay or craigslist account, so that's a good thing.
I don't have any words of wisdom

other than I feel yer pain bruthuh. I think it will pass.