They’re going to need to sort it out….some countries have already implemented requirements (Israel for example - need to show evidence of full vaccination, the latest of which must be within the last 180 days - they are currently accepting a GP letter as proof of having a booster)……..
Daughter said she was ill for a couple of days after her booster too…….flu-like symptoms and feeling very drained. We’re all getting Pfizer boosters apparently, regardless of what you had initially.