Gave blood today, probably for the first time in a couple of years–the first time since I got walloped with the vertigo &c. Didn’t know how it would affect me. Seemed to detect a bit more mental cotton than I would have expected from being slightly underslept. All in all, a successful experiment, despite having a less-than-slick phlebotomist. What experience have others?
Alas none - cause I lived in the UK I’m not allowed to give blood in Australia anymore…just in case I got mad cow disease or some such 
The only blood I give is when I have my yearly physical! It does not seem to have an impact on me.
Sarah