Best Sensitive Formula

I have a 5 week old baby boy and I’m formula feeding him bc breastfeeding was too much for me to mentally handle plus he wasn’t getting full or gaining weight. We have been feeding him Enfamil Neuro-Pro and all of a sudden he seems to be so colicy and as if his belly just hurts all the time. So what are the best sensitive formulas? I know Enfamil has a Neuro-Pro sensitive formula. Is it okay to just switch?? Sorry for my ignorance. I just want my baby boy happy!