cetraben ingredients (from netdoctor website) below - I think some people have problems with glycerin? You could consider aqueous cream (large pots very cheap in Boots, you need to ask for them) which was recommended by my dermatologist for eczema and has some of the same ingredients as cetraben but fewer of them. If you do try it just a small patch to test.
You can get non dairy probiotics on websites.
Didn't realise you couldn't use piriton with fits. It is possible to get antihistamine creams but you'll have to ask the hospital about them.
"Aqueous cream is a light, non-greasy moisturiser that provides a layer of oil on the surface of the skin to prevent water evaporating from the skin surface.
It is made from a mixture of emulsifying ointment (which contains paraffin oils) and water, with phenoxyethanol as an antimicrobial preservative. "
"Cetraben emollient cream is made from a mixture of white soft paraffin and liquid paraffin with water, to produce a thick moisturiser. It works by providing a layer of oil on the surface of the skin to prevent water evaporating from the skin surface.
Cetraben also contains glycerin, which is absorbed into the skin where it attracts water to itself, helping to retain water in the skin surface.
Other ingredients are emulsifying wax, cetyl stearyl alcohol, butylparaben, methylparaben, ethylparaben, propylparaben, phenoxetol, citric acid and purified water."