How do you deal with mental exhaustion? What about that double whammy of mental AND physical exhaustion?

I'm suffering from some serious mental burn out. I don't even find joy in photography right now....and that's saying a lot. I love my clients, and I'm thrilled with how their photos turn out. But I'm just...so...tired all the time.

I left for the mountains on May 15th. I had several sessions scheduled for the 19th and 20th. It rained every day, so all but 3 sessions were rescheduled. I'm very thankful to God those three photo sessions were able to be done, and they turned out so well. I was home for less than 48 hours when I had to repack and head out another 6 hours away for a medical appointment. The trip was...hard. the appointment was good, but the overall trip was rough. Now I've been home just over 24 hours, and I'm just wore out!