Colic Baby... help

My daughter has begun to show some signs of colic. I started out breastfeeding, and supplementing with formula. But since she was having mostly formula I stopped nursing altogether. She is now on the Similac Pro-Total Comfort (purple lid), and ever since I completely stopped b/f she has been extremely fussy, and the only way to calm her is to walk and bounce her. I don’t know if it’s the formula making her feel uncomfortable or what. Should I switch to Similac Soy? My older daughter (who is 10 now) had issues with some similac brands but when she was on soy she was much better. Ugh, idk what to do.