Russ,
It's clear that you have alot on your plate right now. Grieve for your friend, prioritize your work schedule and do some "just for fun" playing as soon as possible! Maybe do a free show for someone ... just to separate the "Show" from the "Business"?

Lot's of people feel a drop in energy after the holidays. I think it's natural to come down hard after the high of planning, visiting, parties etc. January is a time for rebirth. Re invent yourself, or at least a part of you and you'll be back, stronger than ever, before you know it !