Getting to School: Playtex

Breastfeeding Mom Going Back to Work, and 4 Month Old Won't Take a Bottle!!

I am going back to work in a week and my 4 month old son won't take a bottle!! I have tried Dr. Brown's, advent, and playtex vent-aire. He used to when he was smaller, but now he SCREAMS and won't have anything to do with it. I am desperate, any suggestions would be great! Thank you.