In addition to having diarrhea, you could have signs of feeling ill from the other end of your body. Similar to diarrhea, vomiting is a strong defense mechanism your body employs to fight the infection in your stomach and body. Typically vomiting is a more severe symptom when it comes to food poisoning and if you are vomiting, you need to make sure to rehydrate and monitor your symptoms closely. Vomiting typically subsides as the illness begins to heal, but if you are vomiting for an extended period of time (more than a day) then it is wise to consult with your doctor or qualified healthcare provider.
Chances are if you have been infected with food poisoning and you have some of the signs and symptoms listed above, there could be a chance that you could have a headache that lingers. Headaches are caused by a number of reasons, but when it is related to food poisoning, it most likely is due to excessive pressure in your cranium due to vomiting or due to dehydration. If you have experienced diarrhea or vomiting then you should look to rehydrate your body as soon as possible to help alleviate or prevent headaches from coming along. If you are unsure if you have food poisoning and you have symptoms, it is always wise to seek the help from your physician.