How do I tell obgyn I don’t want to breastfeed?

My OBGYN got really upset with me when I mentioned I don’t want to breastfeed. My reasoning is something I didn’t tell her because I feel it’s not anyone’s business. I have mild Tourette’s and when I get extremely sleep deprived I have night terrors that make me hallucinate. I don’t want to mention this because I don’t want to seem like I’m a danger to anyone, because in fact it’s the exact opposite. When they happen I’m frozen in fear and have to go hide away when they’re over. My husband is great and I know if he took one shift and I took the other we could both get good sleep. I don’t know how to mention this to my OB though without causing drama but it’s really important that I can get as much help as I can.