Urmstongran
I had the Moderna with the new variants and my ‘flu on the same day - last Saturday morning. I felt fine all day, went to bed and woke at 2am Sunday morning aching all over ... back, shoulders, neck, arms. This lasted all Sunday and Sunday night through till Monday night when I took ibuprofen on top of paracetamol. I was fine Tuesday morning.
... same with me after the Moderna and 'flu jabs.
I thought I'd been sleeping in the "wrong" position when I woke up early-doors and my back, shoulders, neck and arms were aching.
Got a thumping headache too and the fatigue was something else!
I also found the ibuprofen / paracetamol combo worked well.
Himself, who's quite disabled, was toddling around on his Zimmer trying to look after me... I got a nice cup of tea with honey, well, what was left of it by the time he'd wobbled from the kitchen to the sitting room 
He'd had the same vaccinations and felt absolutely fine!