Oh OP, I've been there.
I'm still there! Except it's become totally normal for us now.
My 7 year old went into anaphylactic shock at 5 months when he first tried dairy.
He was breastfed and I had to eliminate it from my diet as well.
Turned out he was also anaphylactic to dairy, egg, nuts, shell fish with moderate allergy to soya, wheat not to mention the reactions he has to polyester, leather, feathers, pollen (grass is a fricking nightmare).
We have a very very allergic child.
And yet I can still tell you this - even if her allergies don't get better, the situation will.
You learn to not even see the items that contain allergens in the shop. They simply stop existing to you. You learn to bake totally differently. Your go-to recipes which are the exact same foods as before are simply adapted with different ingredients.
15 months is a really tough time but I promise you, it gets easier even when the allergies themselves do not.
My son can eat whatever he wants now - just his own version of it.
When he was first diagnosed there was no bread option for him in the supermarkets, they all contained egg, wheat, soya or all of the above. I had to bake bread from scratch. Now not only is there bread, there's pitta breads pizza based, rolls and more besides!
And now they have a dairy, egg, but, soya and wheat free cheese pizza in Tesco!!
Amazing!!
If there's a particular food you miss, or something you want to cook just say and I can tell you how to do an allergy free version.
Good website to use is Pig In the Kitchen if you like baking cakes etc.
There's lots of Facebook pages too.