I am very allergic to artificial sweetners! I get complex migraines where my vision goes, my tongue goes numb preventing me from talking right, light and sound sensitivity, nausea, and horrible a migraine!
I got the same scared look when I told them...but then the nutritionist adapted the diet for me!!! I am doing a shake in the morning, 4-6oz Protein for lunch and dinner with as much non-starchy vegetables that I want (Basicly a low carb diet). The first week I lost aprox 10lbs and I like my shakes so much I'm going for at least 2 meals!
Try GNC 100% Whey Protein (I think they are the Pro-Performance)...I know that they have Vanilla, chocolate, and Unflavored that are ok and without sucralose(aka splenda). The other flavors have sucralose in them so be wary. Also, I am mixing mine with 8oz of vanilla light silk. They taste just like milkshakes to me and take care of that sugar/sweet that I want.
Also, be wary of the liquids you take when you get tests or fills done. They usually have artificial sweetners in them.
One more thing...try the stevia in the raw...it is a good alternative sweetner and it has no chemicals like the other stevia brands!
Good Luck!