Peanut butter
P.S. I am 11 days out and my nutritionist never mentioned not adding different flavors to my shake - as long as I'm on liquids.
I do PB2 and I LOVE it !! Some people don't like it so you have to try it & see. Wayyyyyy less calories than real PB

Maureen Tired of Living my Life in the Dark
Did you really mean chocolate milk?
Was there a lot of sugar in the milk? That would be my concern. I also could not have tolerated raspberries at 11 days out.
Sometimes light peanut butter has a little more sugar too.
Chocolate milk has a lot of sugar.
I was told peanut butter is considered a solid, not a liquid. I only recently started adding a small spoon of PB to an occasional shake. I haven't had any problems & I'm 4 weeks on Monday.
My guess would be either you can't handle PB yet, or the chocolate milk had too much sugar (or both!)
I also agree about the raspberries. The only fruit I can handle is a few slices of banana in a shake.
Oh wow I didn't even see the part about chocolate milk. Chocolate milk and PB is way too many calories/sugar for a shake.
Hala. RNY 5/14/2008; Happy At Goal =HAG
"I can eat or do anything I want to - as long as I am willing to deal with the consequences"
"Failure is not falling down, It is not getting up once you fell... So pick yourself up, dust yourself off, and start all over again...."