Milk and cheese and yogurt, oh my!

Madison has now been (mostly) dairy free for about 2 weeks now. Her vomiting has been reduced to the days when we slip up and she eats something that has milk in it.
We visited the doctor again today. She was as surprised as we are. We are remaining in the "experiment" stage of treatment though. Since this aversion to dairy came on so suddenly, we are examining it very carefully. Doctor's order are to continue dairy free for a couple more weeks. Then, a little at a time, re-introduce some cheese or yogurt (not straight milk) and see what happens. If the vomiting returns, then we will proceed to an allergist where Madison will undergo allergy testing to figure out which part of milk is making her ill (milk protein? lactose?) This will give us a clearer picture of what is happening and what we have to avoid. For instance, if it's lactose, we simply have to substitute lactose-free options, or apparently there is a medication (Lactaid) that can help. If it's milk protein, then we will have to avoid anything that has milk, or bi-products of milk, in it.
A little bit of good news.....I was convinced that my skinny little daughter was losing more weight than she could afford to lose. She looks like skin and bones to me. However, at the doctor's office they weighed her and she has NOT lost ANY weight. Still hanging in at 51 lbs.
Hooray!!

Maddy Update

As some of you know, we have been working with our pediatrician to figure out what's going on with Madison.  She isn't "sick" as in contagious sickness.  She throws up at night.  She has been doing it for about 3 weeks.  The doctor thought it was acid re-flux.  We have tried 2 different acid re-flux medications, both without any results.  The doctor said, as a shot in the dark, to take dairy out of her diet for a couple days.  Neither of us thought this would produce any results.  After all, she's almost 9, wouldn't we have noticed a milk allergy by now?

However, taking dairy out of Madison's diet seems to have actually worked.  She went puke-free for all 3 days.  Then we re-introduced a regular, dairy-included diet and the vomiting began again.  So here we are on day 2 of dairy-free experiment 2.  The doctor is on vacation so I can't really update her.  I don't know if there is any testing she wants to do or if we just go forward from here with no dairy.

I thought "how can she be allergic to dairy all of a sudden?" and, as I always do when I need more information about something, I hopped onto the computer and began researching.  It seems sudden allergy development is pretty rare.  But maybe it wasn't so sudden.  According to an article on ehow.com milk allergy can also cause long-term symptoms like dark circles around the eyes, respiratory problems and stuffy/runny nose.  All of which Madison has experienced on a regular basis.  She has also has had unexplained bouts of vomiting in the past.  At one point, we thought she was hypoglycemic, and the vomiting caused by too much sugar.  My only question is this: If she is allergic to milk, why does the vomiting come in bouts?  Wouldn't it be an every-day occurrence if she was eating/drinking milk products?