I feel like a lot of people are about to say NO WAY to this. But a new study found most of the mild symptoms you had after getting the vaccine probably WEREN'T REAL. Chances are, you imagined them, or they were caused by something else.
Researchers at Harvard looked at data from 12 different clinical trials, and found the PLACEBO effect actually caused most of the side effects people reported from vaccines. Or technically, it's the "NOcebo effect." That's when you experience negative symptoms instead of positive, and it's just because you're expecting them to happen.
They found that 76% of mild side effects from the first dose, like headaches, fatigue, and even arm pain, were usually imagined, or caused by something else. And 52% of mild symptoms from the second dose weren't really caused by the vaccines either.