I'm getting my fourth in early May. I don't remember much of reaction to the first shot, but they've been getting worse since then. This time, I know to have a couple of easy meals, and stick a cane in my bedroom so I can get to the bathroom. Then, the day after the day after, all better. One day of not wanting to be conscious, and not walking well, and probably other symptoms I don't remember, is better than covid.