Someone mentioned depression. I've thought about that, but I'm not sure that's it, but it could be, I guess. I hunt on my grandmothers property a good bit, and always have. I would hunt there, then go in and visit with her after each hunt. I always enjoyed that. She passed away this summer, and I don't know if that has something to do with it or not. It's hard to say.
Hard to say but you said it, and I think this is exactly what I was talking about. Bow season for me is meeting up with my Dad and brothers at my Dads house at 5 am, drinking coffee, watching some hunting show for a bit and heading out in the dark for a day together in the woods. We meet up for lunch, talk about what we had seen, hunt the rest of the day and meet again for dinner that my Mom made and talk hunting some more. We hang stands together, shoot together..etc.
Seeing your Grandmother and talking to her gave you purpose for your hunt and made you feel good about it. I think this is the majority of your problem. Depression is a part of natural life. Does NOT mean you need pills for it, as it will likely take it's course and pass as you make new connections with others.
Take care!