I'm so glad to know I'm not a freak for this. I am the same way. I have MDD and this is the worst it's been. I'm at the point now where showering takes up all of my energy so I generally only do if I absolutely have to go out of the house. I went almost 3 weeks last month.
Oddly enough, my husband said when I go so long I start to smell like food and not gross. It freaks him out.
Procrastinating is my number one hobby these days.