I'm not sure worker's comp is the way you want to go with this. Just because you are injured at work, doesn't make it a "work related injury". It never hurts to file a claim, but eating a holiday dinner is not normally considered a work related injury. Your manager did, however, tell you that the food contained none of your allergies - which it clearly did. His negligence resulted in your injury, missed work, medical bills, etc. You may have a small claims or personal injury case, rather than worker's compensation. Speak to an attorney (one with a free consultation) regarding the details.