Relax. You are probably fine. If you wish to contact the Board of Health, you may do so, but you do not have enough for a lawsuit. The sandwich shop will be more than happy to offer you a refund a free stuff but you may not want to return there but vomiting is not enough damage to take this to court.
I'm sorry to hear about this, and the owner should get you a full refund and perhaps some coupons.
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While your case may not have the value of a serious injury case, there are attorneys that will probably assist you. I would consider contacting an attorney regarding this matter. In my experience, you might uncover a pattern of such activity and in Illinois, you can recover for "risk of future injuries." An alternative is to make a direct claim with the place and ask that their insurance company to contact you. This is merely general information and you should know and protect your legal rights. Lastly, vomiting is a common response in these situations as I have reviewed cases and handled similar cases where once the person realized the contaminated food, the initial bodily response was to vomit.
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