Help a mama out please

Katie

3 months old EBF- today and yesterday isn’t feeding as well on average normally he would have a 10 minute feed but the average recently is 3minutes and he’s very unsettled screaming and bringing up more milk than normally.

Should I be worried? He’s having wet and dirty nappies but the colour of Poo has darkened from the bright orange.

Any idea what could be happening? Could it be 2nd jab related although that was almost a week ago.