Am at a loss to explain both DSs odd 'allergic' presentations- random 'hayfever' like attacks, streaming noses, sneezing, itchy eyes. They come on out of the blue and disappear almost as quickly. They both do take a lot of Asda's own brand anti-allergy tabs but I so wish I knew what was setting them off- and no, the GP won't test them. I'm pretty sure it's not the usual suspects: cats (mother has 2), dust mites (why does the reaction come and go?), hayfever proper (can walk across a mown field OK)- so what?
We do, however, live in a very damp rental bungalow. We're talking dark recessed corners with actual 3D black mould! I do bleach regularly. There has also been dry rot under one of the floors!
Might the coming and going nature of the DSs reaction be explained by mould going through its lifecycle of 'fruiting' or whatever it is it does?