2 1/2 old baby turns colic?

My daughter turns 3 months old Oct 16. These past two weeks have been the most toughest time of my life with her. She was the easiest baby, I knew exactly what she wanted, she slept great, ate great, seemed a lot more happy, and just more content. All she does it scream now; she even crying when you hold her at times, she fights her naps during the day, she’s just so hard to deal with. I have no idea we’re my good baby went. I had a mental break down yesterday when I couldn’t even take my shower with out hearing her bloody murder screaming. I can’t take it. I have the wonder weeks app and apparently she isn’t in a leap. On the side note, she basically sleeps though the night, idk if that change to her body is making her like this? I’m also EBF. My diet hasn’t changed. Does anyone else have trouble sleeping after a middle of the night pump session? My body fights sleep also, so between barely getting sleep and screaming all day I’m gonna lose it. My pediatrician basically just said, she has colic, just a phase... like what. I thought 3 month old baby’s are suppose to grow out of colic around that time? If your going through this also I feel your pain, this is rough.