When I had the AstraZeneca vaccine, I felt rough for a period of about 24 hours, beginning when I awoke the following morning. It was like a bad flu, and I was bedridden for the day. I had fever, chills, shivering, sweating, myalgia, malaise, and headache. I would not have been able to go to work the that day, if I had needed to work. Fortunately it was a Sunday. (I mentioned earlier in the thread that I was due to receive it on a Friday, and that's true, but the appointment got cancelled and was rescheduled to the following day.)
Also, another tip for getting vaccinated is, if you have a preferred side for sleeping on, get the vaccine in the opposite arm. I learned this the hard way by not specifying a preference. I did not foresee the consequence of getting the vaccination in the arm of the side I prefer to sleep on (it exacerbates the pain of the injection site).