You lucky lucky people who have had no side effects. For me Pfizer 1 and 2 felt fluy and headachy afterwards needing to stay in bed for a couple of days, and my poor arm. For a week after my nose was full of bloody mucus. The booster was horrendous - symptoms starting a few hours afterwards : headache, fever, chills, heaviness, agonising low back pain, nausea, vomiting and diarrhoea, with suicidal thoughts. My arm was so painful I didn’t sleep well. Unable to get out of bed the following day, abdomen very painful to touch, and hard to feel. Bleeding gums on cleaning my teeth for two days and again bloody nasal mucus. I still have abdominal discomfort. I reported my reaction on the Yellow Card system. I am not prepared to ever have another booster and will take my chances in the future. (Years ago pneumonia was known as the old person’s friend, who wants to be looked after by the couldn’t care less system?)