As regards your allergic reactions, I should imagine the CAA would be interested in the magnitude of the reactions you experienced.
I guess at one end of the scale, something like rash would not worry them too much. At the other end of the scale, something like collapse, wheeziness or anything concerning your breathing would, rightly, concern them more.
I'm not sure about the relevance of the epi pen prescription, is your GP being over cautious, or has he prescribed it on the basis of some empirical evidence, (eg advice of an allergy clinic, ige testing etc.)
Don't no much about the eyesight stuff I'm afraid.