After flying to Lukla and a couple of days hiking got to Namche (3400m) last night. However that evening after dinner ended up fainting a couple of times... I put it down to the long day hiking, some early starts, and probably a little dehydration.
However, the guide of course had to take a conservative view, and last night made arrangements for me to come down and back to Kathmandu in case it was something more major or altitude related.
Disappointing, but can't do much about it.
Given that was 100% this morning after a good sleep (and the speed was able to start hiking down today), pretty sure wasn't altitude related.
Will post some details of what I did see of the Himalayas (and photos) once back to Kathmandu.