Hoping this topic is acceptable in this forum. It's somewhat personal, hence my hesitation. However, considering that most of you racing this beast have seen a lot of saddle time/training time over the years, I figured there might be someone who has gone through this. 

Starting this year, after overnight rides, or long back-to-back big rides, I am falling into this very awkward state of depression for a few days afterwards. I can't stand the thought of getting on my bike during this period. My overall motivation to do anything declines. After ~2 days, everything is back to normal and I get giddy about getting back on the bike with my tent and sleeping bag.

I have found a lot  of articles talking about post-race depression being common in triathletes and the theories for what causes this. Some of that info is relevant and the treatment sort of discusses how to recover after a triathlon, not a whole lot about what can be done prior to or during a race. Given that this race is going to take me 8-10 days, I can't start "recovering" on day 2 or 3.

I'm not seeking  a diagnosis, but if you have any experience in getting over this hump, let me know. I am in my late 30's, male and have been bikepacking for 5 years. I have been racing road bikes and mountains bikes for decades. I have not changed anything I have ever done in the past. I eat the same, my hours on the saddle this year are right in line where they have always been. The only perceivable difference I do notice, is that my appetite in general has been somewhat particular. Meaning, that sometimes foods, when I feel normal or depressed, don't seem desirable.  Personally, I  have a simple life with little stress and this is getting frustrating.

Maybe I am just getting old.