I have had both (pre covid) more than once in the past as it was convenient whilst at the surgery for the B12 to have the 'flu jab at the same time. It's never been a problem for me.
I think it's more likely to be a reaction to the vaccine for you rather than anything else,
thank you so much Clive for taking time to reply and I agree it could well be a reaction. Hopefully tomorrow will be better and at least I’ve had my B12. Very best wishes
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