Barb, Thanks for all your advice and info. I haven't got back to posting as I haven't had time to post a proper reply. So an update.

DD is heaps better! She has had a few days of having good day sleeps. I have removed all obvious dairy products and am slowly finding out about the hidden ones. I will try to see a dietician when we go away next or if it flares up bad again then I will try to have a phone consult with one. I must say there has been a huge difference.

DH has also been a lot better. He is able to sit through the scream attacks to get her asleep at night and generally can now settle her quicker than me (I think because she can't smell my milk??).

Overall things are just a lot better. She hasn't had a day sleep for the last couple of days. But I'm just over the moon. Despite MIL telling me she is crying because I'm starving her by not having her on solids already as they used to start them at 4.5months and her kids survived

Which book were you recommending? Sorry but this baby brain is killing me.

Once again, thanks! I really believe you saved my sanity, DD's health and definately stopped a marriage breakdown!!