Can you imagine how quickly businesses would go under if they reimbursed everyone who had diarrhea after eating in their restaurant?

It is dangerous to make assumptions on what caused an enteric illness unless a stool sample has been taken and an investigation done by the local health department.

There are 1001 things you encounter each day that have the potential to cause diarrhea and stomach cramping. It may not have been the food at all - the person opened the door to the restaurant right before you did might have had the norovirus on their hands and it was transferred to you when you opened the door. This is also a valuable lesson that you should ALWAYS wash your hands right before eating.

Was the lobster the only food you ate that day? While it definitely COULD have made you sick, there is no proof that it definitely IS what made you sick, and if your husband is indeed a doctor he should know this.