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Hi Dr Mo here, please give me a moment to reply.
I think you are safe taking the evening pill as long as you aren't feeling weak.
If you are feeling lightheaded or weak then I would skip it.
And yes, it is most likely the side effect (or a normal effect) of the flu shot.
How are you feeling otherwise? Any headaches or body aches? Are you well hydrated?
How's your pulse today?