Crying and screaming

My little girl did something similar around that age. Sometimes it was trapped wind, sometimes she was overtired, and sometimes she just seemed completely overwhelmed and would suddenly scream like she was in pain. She’d often refuse the breast until she’d calmed down, then latch and settle.
I’d definitely get him checked over if it’s happening regularly, just to rule out things like an ear infection, reflux, constipation, or anything else causing pain. I’d also give him a quick head-to-toe check when it happens, especially fingers, toes and his penis, to make sure there’s no hair tourniquet, as they can be surprisingly painful and easy to miss.
Hopefully it’s just a phase, but if it’s persistent or he’s inconsolable for long periods, it’s worth getting him assessed. ❤️

Could be teething, and sometimes when teething they refuse boob because the sucking irritates their sore gums. See if you can see swollen gums and try a frozen pacifier, etc. When teething my boy can be fine for hours and then suddenly scream, then be fine again