the main type of eggs available on madeira are one of the allergens... now i've remembered i had this problem previously with them, it's a combination of things, my autoimmune reaction builds up and once it passes a threshold the eggs start to trigger asthma 

 No eggs is a small sacrifice for feeling better. Like the old Dr. joke…It hurts when I do this…stop doing that😉 

 yeah, madness... and it's these particular eggs, and the problem went away after a long time not eating them