Hi Linda,
I don't know if you have seen this on the website, but it may be useful:
http://www.max-the-schnauzer.com/hypoallergenic-dogs.html
Here's another useful source of information:
http://allergies.about.com/od/specificallergens/a/dogallergy.htm
It could be that you are allergic to other puppies in the litter. Or, it may be that there are several puppies together and the combined effect is too strong for your system to cope with. Everyone with allergies has a certain level of tolerance. When Max comes home, you might find that you are OK - we will keep our fingers crossed.
If you do experience a slight allergy to Max when he arrives, it is not unusual for allergy sufferers to build up a level of tolerance to their own dog.
It's a good idea anyway to keep him out of bedrooms and try a HEPA air filter and vac.