Had 2nd Pfizer jab on Monday morning. Felt fine until about 9pm when I was suddenly really tired, started feeling achey and developed a splitting headache. Woke up the next day with a splitting headache, really achey all over and not much appetite (very unusual for me). Paracetamol dealt with the headache and muscle aches but felt really groggy and low energy. A walk to the park and back had me needing an afternoon nap! Felt much better by the time i needed to go to sleep when I was of course wide awake from napping 😂 Men may want to cover their eyes for the next bit, but have slight menstrual cycle disturbance today of bleeding between cycles which I have never had before, so seems likely it’s connected. Worth mentioning for any other women reading (jab received in week 2 of cycle). Dr Jen Gunter has written a few pieces about the relationship between vaccines (in general) and the menstrual cycle. Largely poorly studied (usual excuses, too hard because women have different hormone levels across their cycle) but essentially disturbances are normal post vaccine.