surgery and breastfeeding

Tatiana🇨🇷♈️💍🇩🇴♏️ • Happily Married. 💏 👰🏽 12.19.08 💙 07.10.16 💓 02.29.20 💙 🐸 🤱🏽BreastMILK is best 🚫 formula
Sadly I have a bronchogenic cyst behind my heart which requires surgery.. my recovery is about 2 months and the doctor said I will definitely need some type of narcotics for pain (OxyContin, Percocet).. I have freezer stashed of milk but was wondering if anyone had any suggestions on how to keep my supply up since I figured I would be pumping and dumping ??  I'm ebf and baby is 5 months