Feeding help- 8 week old

Ladies, I need help.. my daughter's pediatrician isn't helping with this issue so I am reaching out to see if anyone has been through this.

My daughter is just shy of 2 months. We have her on pepcid, gas drops and nutramigen for formula. My daughter is an awful eater and I don't know what to do. When she is eating she takes 5-10 gulps and starts to kick, stretch and cry. I have a to take so many breaks to calm her down. I am at a loss and I am beyond frustrated. Some feedings take up to 40 minutes for 3oz. Has anyone been through this? And what did you do to help?