Colic

how do i know if i have a colicky baby? She is two and a half weeks old and starts crying/doesnt sleep from 10pm-3am usually between those hours with uncontrollable crying. There is no way to soothe her, shes fed and diaper changed. Sometimes its so hard to get her to burp. I dont know if the formula needs to be changed, shes very gassy and diarrhea- (for me i know im lactose intolerant and we just found out dad is because his mom told him this weekend so we dont know if we should change formula to a lactose free or soy milk- i do breastfeed and supplement with formula) I dont know what to do should i try gripe water or gas drops!? HELP! 😩 i am desperately sleep deprived and I feel heless when I cant figure out whats wrong with her and how to get her comfortable!