coworker set me up

I work at a café, manning the sandwich station in the kitchen. Earlier today, I was wiping shit down for close when one of the baristas asked if I wanted a drink. I agreed, sensing my blood sugar waning, and decided to down it and go on a cig break. Turns out the little latte he handed me was straight whole milk. I've now spent the last hour running to the bathroom thanks to the maelstrom of nicotine and lactose sieging my digestive tract. FML