Food Allergies Treatment

I have heart palpitations, dizziness and breathing struggles now. My rash is also itching crazily. Is this serious?

what are the symptoms?

I’ve always been a little sensitive to whole milk, but lately I’ve been getting sick from all types of dairy products. Has anyone ever heard of an allergy springing up during pregnancy… In the 35th week even?
(and yes, I shall ask my doctor Friday, but I want to know if anyone has at least HEARD of this before)
Thanks! ^_^

My son is almost 7 weeks old and has been VERY gassy since about 2 weeks old. This is extremely painful for him and he is fussy because of it. It is also painful for him to poop. We have tried gripe water and mylicon…none of it helped.
We have him on probiotics and are taking him to the chiropractor. This seemed to be helping but he has now gotten worse the last 2-3 days. I’ve been reading about milk protein intolerance/allergy.
What is the difference? What are the symptoms? From what I’ve seen, symptoms often include some kind of rash or blood in stools. He has never had any of this…just horrible, painful gas. He does spit up a lot too, which has gotten worse. I’ve wondered about reflux but know that has nothing to do with the gas.
Is it possible he has a milk protein intolerance or allergy without the other symptoms? Just the gas and spitting up.
I am breastfeeding. If this is a likely possibility, I will cut dairy out of my diet. But if there is no chance this is a possibility, I don’t want to deprive him and me of those nutrients.

My son was just diagnosed with a milk allergy and we have switched him to Soy milk but I am confused on how long it’s good for? I bought it a week ago today an the expiration date says July 11th. So, does it stay fresher, longer than cows milk?