This was exactly the same for me, except I passed out both times
itās a horrible feeling and very annoying as I really would like to be a regular donor.
The first time was especially funny as Iād taken my gf at the time along with me to show her how easy and not-scary it was. Then she looked away from the TV to see me being upended in a chair by panicked nurses and being screened off to not spook anyone else.