@BobbySD345 thanks for your reply!
Yes her nappy rash cleared within a week (it was honestly awful, we were referred to the tissue viability team it got so bad!), poops went down to a couple a day from 10-15+, and her face cleared up. I "think" her reflux improved but we have never had a day where she hasn't been sick. I'm not talking projectile, but we can't not wear a bib or have muslins to hand :(
I'm now 4.5 months dairy free and not finding it too hard any more (although I can't wait for a cheese sandwich, the simple things!)
DD doesn't seem too concerned by the occasional spit up/sick but I think as she gets older it's bothering her a little more than it used to. And the runny poops have never really stopped.
Her weight seems to have slowed down the past 6 weeks or so which also concerns me (although the HV aren't concerned). She put on really well the first 6 months and although she hasn't lose weight, she hasn't gained much recently. Although they say this can be normal for breastfed babies.
On the 2 occasions I've trialled dairy her only additional symptom seems to be nasal congestion. My gut is telling me there's something else (maybe egg) so I'm wondering whether to cut that out of my diet rather than trying weaning her directly with it....
I think being an allergy Mum makes you second guess every symptom against everything you eat, and everything you put in their mouths as well!
I did consider a private allergy check so may look in to that more....