Another thing you could try is beef gelatin, which is available online and at some health food stores. Most gelatin is made from pork. I have heard that pork causes an insulin spike and that could be making you drowsy. Beef gelatin may be better for you. Also, I would not use skim milk and most ice cream. Haagen-Dazs is the only brand I know of without a big list of additives. Try their vanilla, chocolate, coffee, strawberry, and maybe rum raisin if you don't mind a little alcohol. Make sure the sour cream has no additives, too. Daisy Sour Cream has nothing but cultured cream. Most other brands have dozens of additives. Cottage cheese also has additives typically.
I suggest Farmers All Natural Creamery Whole Milk, if you're concerned about processing. It's organic, non-homogenized, grass-fed, and vat-pasteurized (30 minutes at 145F). It's not fortified, either. Some health food stores (like Whole Foods) carry it in the USA. I don't know where you are. You might be able to find something similar or even raw milk. Cheese may be best, because it stimulates less insulin than milk.
http://www.thepaleodiet.com/articles/Milk%20Final.pdf |