I, too, can vouche for "drugged out" feeling immediately after birth. As a caveat, I don't know if my spacey-ness was a result of the natural childbirth OR if it was because I hadn't slept in 2 days.
But I do look dazed in the first pics with my son immediately after delivery. And in one of the next few pics of the series, I look like I'm sleeping. LOL! I remember my sister telling me a couple months later that I kept falling asleep/pasing out for a few seconds at a time in the L&D room before I got transferred to the recovery room. WTH?!
And I do remember feeling like I had a major caffeine buzz for at least a couple days afterward. I could barely sleep, I was so wound up. Part of that could have been because I was afraid to fall asleep because my son kept choking on the amniotic fluid that kept coming up out of his lungs (he did not cry at all after delivery). NOT GOOD AT ALL for someone who hadn't slept for so long.
He did develop colic before we even left the hospital. OMG, it was hell. I did not cope well with that AT ALL. A therapist I saw earlier this year told me I undoubtedly had untreated PPD and PTSD as a direct result of that experience, as well as other things going on my life at the time (major home addition with dust and noise everywhere for the first 8 months of my son's life, a newborn who didn't sleep for the first 11 months, deaths in the family, etc.).
I guess what I'm saying is that despite having a natural childbirth and getting that hormonal epinephrine high, I still was not able to cope very well with the curveballs life was throwing at me.