need suggestions, rashes, hives, new allergy?

I am going crazy with my almost 3 yr. old daughter and could use some suggestions before I head to the Dr.
Background. At 14 mo had ana reaction to peanut butter. At 29 mo. had full allergy tests (rast) because of behavior problems. Few environmental allergies, no food allergies (except peanut and they didn't test any other nuts.) At 31 mo. she had 4 mild reactions in one week. I finally realized it was walnuts and she was diagnosed allergic to walnuts and pecans.
Now, she has had two different types of hives/rashes and I recognize what each is from but now we are having a third type.
She is itching and has red patches on different areas of her body. Sometimes round "bug bite looking" marks in the red areas, and sometimes not. The first three times were while she was eating homemade strawberry smoothy and so I thought strawberries. Then she had a bad one after church. No strawberries. Just animal crackers and I am waiting on the drink. She said milk, but I'm guessing water.
However, I have made her drink her milk, or given her yogart on three diferent occassions since and within 30 minutes she has the same reaction. It is a little on her face, some on upper chest, upper back, butt, some small areas on legs and arms. Sometimes there is a stronger reaction than others and it will last from 15 min. to 45 min. She is also rubbing her nose constantly for the last couple of weeks.
I'm thinking milk, and she doesn't drink much anymore as she refuses it most of the time, but don't most milk allergies show up early on as babies? Would these be considered rashes or hives? She had one of friday, two on saturday and two on sunday, and three so far today. That is too often for my comfort even though they are not severe reactions.

We do have several sensory issues and have been doing the brushing therapy. I increased the brushing from four times a day to five or six times a day about the same time she started having these problems. Could that stimulation of the skin have anything to do with this?

I know you all can't diagnose for me, but several of you have dealt with allergies and hives with your kids and I am hoping that someone might have some suggestions. We go to the allergist next week, but we have to travel four hours, so it is only about once a year.