It is because you are relatively young and fit. I had the AZ and was fine on the day but felt a bit shit/Fluey the next day and then was fine. I have a compromised immune system anyway and so my fitness level is not great. A lot of people 60+ are having little to no side effects. As long as your headache goes you should be fine. If that persists for more than a couple days then it might be worth ringing 111 at least.
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