Vaccine side effects?

Little one had their 8 week vaccines two days ago, first day very sleepy as expected. But then last night he was sooo unsettled. Crying constantly. Seemed to be in a lot of pain in his stomach? Wasn’t able to lie him on my chest which usually would settle him as he would just writhe and cry more. Gave calpol as he seemed super uncomfortable which didn’t help. Was an awful night as he just couldn’t settle, and even if he did was awake an hour later. Did anyone else have side effects lasting a few days? Hopefully it passes soon, the poor boy 😔