well I didnt think it was the marshmallows, I thought maybe it had something to do with the sugar.
Yup, I drink my protein shake after my workout.
Yup, I know better than to eat the marshmallows
My first offical workout was excellent, but I was wicked sore for days afterward. (like never in my life) But I got over it, and thank goodness it hasnt been that bad since.
Thanks everyone for your imput!