Freaking out

My period started and my milk supply TANKED! I am about 2.5 months post partum and a few weeks ago I started on the Pill. My doctor said it may decrease my milk supply but I'd probably be fine (as milk is literally spraying out of my boobs and soaking my exam gown lol.) I didn't notice any change until the third week of taking the pill and my period started. This is my first period post partum and it started in the middle of the pill packet. Now is been going for over a week and my supply is seriously depleted. This morning I pumped one oz. I usually pump 5. My LO won't sleep at night because she's not getting a full belly. Has this happened to anyone else? Did your supply come back? I don't know what I'm going to do.