Too much milk? (x-post)

I've tried for MONTHS to find a protein drink I can tolerate, but no luck.  However, I do like and can drink skim milk.  (I used to add SF Carnation Instant Breakfast to it, but now that doesn't taste good.)  So I've started drinking about 3 cups of milk per day, which is how I reach my protein goals, since this gives me 27g of protein.  I also usually eat at least one lowfat cheese stick per day, so I get about half my daily protein just from the milk and cheese.  Does this seem OK?  My next dr's appt is in March, but I'd love some thoughts before then!

Thanks!
Steph