Widespread musculoskeletal pain is the most common symptom of fibromyalgia. It generally occurs at multiple sites throughout the body, although it may start in one region, such as the neck and shoulders, and later occur at other locations over a period of time.
But it can develop later in life. A milk allergy is an immune system reaction that causes various symptoms to form within the first hour of consuming the dairy product. Headaches and fatigue related to a milk allergy are the result of sinus inflammation.airy products on tabletop. Photo Credit Digital Vision./Photodisc/Getty Images. Consuming dairy products doesn't cause headaches and fatigue in healthy adults. If you eat dairy products and get a headache and fatigue, you may be allergic to milk or may be lactose intolerant.
Allergy. A food allergy may produce symptoms that affect your stomach and gastrointestinal system. In some people, food allergies cause cramps, stomach pain, diarrhea, nausea or vomiting. These symptoms can occur alone or in combination with skin effects, such as rash or hives, and respiratory symptoms.An allergy to milk protein may cause stomach problems and most chocolate contains milk solids.owever, some people are sensitive to one or more ingredients in chocolate. If you experience gastrointestinal symptoms such as stomach ache, abdominal cramps, gas, bloating, nausea, diarrhea or vomiting after eating chocolate, you may have any underlying health condition.