From what you are saying it could be an allergy to salycilates - I forgot to mention I am also sensitive to these in large amounts. Can't have asprin, lots of berries and grapes, heaps of strong tomato sauces. I have just lifted this from fedup;

"Some natural chemicals called salicylates can cause the same problems as additives if consumed in large doses or by sensitive people. For problems serious enough to see a doctor, or conditions with a diagnosis such as ADHD, eczema etc it is best to find out more about salicylates, as well as other natural food chemicals called amines and glutamates.

These natural food chemicals are increasing in our food supply, due to increased availability of out-of-season fruit and vegetables, concentrated natural chemicals in processed foods, and added flavours. Foods high in salicylates include strawberries, kiwifruit, avocadoes, sultanas and other dried fruits, citrus, pineapple, broccoli, pizza toppings, tomato sauce, olive oil and tea. Cheese and chocolate are particularly high in amines. Salicylate sensitivity can be triggered or worsened by medications such as aspirin and other NSAIDs (non steroidal anti-inflammatory drugs) such as Nurofen and lotions e.g. anti-arthritis, salicylate-containing teething gel.

People rarely realise that they are affected by salicylates or amines unless they eat a very large dose in a short time (e.g. salicylates at Christmas or amines at Easter) or until they reduce their intake. This is because these food chemicals are eaten so frequently that the effects fluctuate and can build up very slowly. One mother wrote:

'I cut back my five-year-old daughter's intake of fruit to about a quarter of what she normally had. Within days we saw dramatic changes. Her behaviour evened out … she was more sensible and obliging, less aggressive and defiant - and altogether much more pleasant to live with.'

Flavours and fragrances such as fruit or mint (e.g. in toothpaste) are another source of salicylates. Since the 1970s, increasingly large doses have been added to products. In the UK, recent studies of new mothers found more headaches and depression in mothers and more asthma, diarrhoea, vomiting and ear infections in babies with increasing use of air fresheners and/or aerosols."