process of elimination

1 pk carnation instant breakfast chocolate no sugar added
1 scoop vanilla whey powder protein
1/3 carnation powder milk
8 oz skim milk
3 ice cubes
1 heaping tbl of peanut butter

blend and drink!  Tastes like a peanut butter cup shake

Well the last 2 times I made this after surgery it has made me very sick.  BADDDDDDDD gas and the ****s for 2 days.  So I am trying to figure out what it is, however pretty sure it was the milk.  Ate the Pbutter plain last night and was fine.  Tonight I drank 4 oz of milk...the jury is still out but so far so good.  I hear some ppl dump from the instant breakfast.  But you can substitute the milk with soy, lactaide, or whatever. 

Out of curiosity..is there any sugar or sugar alcohols in your vanilla protein? I wasn't paying much attention and found one that I bought at gnc with like 9 g of sugar and carbs! (probably the milk or carnation that did it no sugar added doesn't mean sugar free, check sugar alcohol and the carbs)

Vanilla whey - 1.5 g sugar per scoop
no sugar alcohols

carnation ib - 7 g sugars
no sugar alcohols


so any thoughts?