Here is a list of symptoms that can be caused by Tomato Intolerance (updated):
Mouth ulcers, nausea, bloating, abdominal pain, intestinal contractions, diarrhoea, flushing of the skin, palpitations, headache, urticaria (hives), and in extreme cases where there is a build up of histamine resulting in a pseudo allergic reaction, even difficulty breathing (in which case, you should seek immediate medical attention).
Note: The above symptoms should not be confused with tomato allergy symptoms. A full allergy is where Imuno-Glubulin ‘E’ in the immune system causes a reaction to the trigger histamine and can be life threatening, so if you have an immediate allergic reaction to tomatoes (swelling, itching, difficulty breathing etc.) then you should seek medical advice.
