traveling without baby - freaking out 😭

My husband and I are traveling from Nashville to Pittsburgh for an NFL game in about 3 weeks. My son is 7.5 months old and will be taken care of by my mother (who watched him the first 5 months while I went back to work so she is very comfortable watching him and I am confortable letting her watch him too). We will be gone for a total of 3 days and I am freaking out because 1. He is breastfed and I have a freezer stash (101 oz) and I am not sure if that's enough....(he does eat solids 2x a day)  2. I have never been away from him longer than 12 hours....