I've been the same but I had my RSV vaccine on Thursday evening, so I've assumed that it's side-effects from that
I had a headache/dizzy for 2 days, also after having RSV vaccine! I thought it was that but my OH also had the same so maybe was a bug, we’re fine now. But maybe worth mentioning with the headache x
It’s worth mentioning it’s probably just a bug as you say but a persistent headache could be a sign of preeclampsia too xx