Oh poor Eimear! Is it possible that there's 'hidden' gluten in the yoghurt as a thickener (it might be called vegetable gum or something else)
My mum has a gluten intolerance (coeliacs disease) and if she has even trace amounts of gluten she gets hives as well as the usual crook gut, vomitting, migraine etc
Out of interest, not that you'd want to try this, but coffee helps lessen the reaction to gluten for those with a gluten intolerance, I'm not sure why or if it works for other intolerances but there you have it (a wee piece of useless information).
Edited by MrsMojo