Moodiness is not one of the listed side-effects of the flu vaccine - could it be that you are experiencing some of the other more common side-effects such as nausea, headache, fever, muscle-aches and this is causing you to feel moody? Otherwise, I think it is the menopause. That can make one very moody - I must say I am not looking forward to it. Good luck and I hope that you feel better soon!
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