Covid-19 vaccine experience

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The first shot only left my arm a little sore later that evening. I was prepared for the 2nd one to hit me like a truck, especially since I only managed to get around 2 hours of sleep the night before. I imagined my immune system wouldn't be firing on all cylinders and the shot would kick my butt. However, I had no side effects besides my arm being sorer than the first time around. This was with Pfizer. Most others in my family had it rough, but a couple also had no effects besides the soreness.