don't worry about it. just go a few days without post workout carbs.
you've got to remember, the body responds to trends in eating and fitness. a few days without dextrose isn't even a drop in the bucket as far as your body and lifespan go.
If anything, make your shakes with skim milk for a few days. extra protein, and lactose sugar, which has a moderately high GI if I remember correctly. or powdered gatorade has dextrose and glucose in it, just drink it separate from the protein shake (cuz it'll taste nasty combined)
table sugar isn't what you want.