2 month vaccine

FTM and a huge overthinker so please bare with me.

Baby boy had his 2 month vaccines a week ago and now I feel like I have a completely different baby. He took his shots like a champ, cried for a couple minutes (my heart broke) and then was smiling away as we got his clothes back on. We followed our nurses advice of Calpol every 4-6 hours as she said the MenB is the one that can cause a fever and that staying on top of it will keep the fever at bay. He ate well the rest of the day but kept fighting his naps (he's been doing this since 6 weeks old) and then it came to 7pm.... I've never heard him ever scream or cry so loudly and it shook me to my core.

He has always been an incredibly calm baby, rarely ever cried unless I was taking too long to fix him a bottle. But now, it's like he's making up for all the weeks he didn't cry and we're struggling to cope. He doesn't wanna nap, he doesn't wanna play, he fights us every step of the way throughout the day and I'm crumbling as even I can't soothe him anymore.

The only thing making me feel better is that he's still eating (6oz every 2-3 hours, he was born 9lb 14oz and is now 13lb 12oz so he's always took bigger bottles) and he has plenty of wet nappies; he's never been a regular pooper but our GP said she had no concerns as long as he goes eventually.

I can't tell if he's in pain, if he's hungry, if he's tired, if this is just normal and he's reached a fussy stage and I've just worried myself to the point that I can't believe that he's actually just okay and this is something babies go through and he'll just wake up one morning my same old Alfie.

My mum is an anti vaxer so I can't ask her as she'll just shove it in my face that she told me that I shouldn't of got it done and everyone I've talked to that has had kids has had an easy ride with their shots so I'm lost. I just want my smiley baby boy back.