This is confusing! It sounds from your post that you were formally tested for various triggering agents. If so, was there a reason? What actual reaction did you have, how severe was it and what treatment did you have?
Once that is established, why is the CAA restricting you? It may be gobbledegook to you but if you pm me I can give you some advice. If you havent been told, ask. Certainly I know of many pilots flying with allergies that are not restricted so there must be a reason.
Finally the suggestion that nobody knows what causes an allergic reaction is wrong. We know very well what happens, and the various types of immune response. We also have well developed methods both of finding out why a reaction is happening (providing samples are taken immediately) and also of testing patients afterwards to see what they react to.