I've not got my surgery schedulled until October, but I'm starting to get organised for it. I'm a tad concernced about the pre-op diet because I'm wondering what I'll be able to eat.

I am outright allergic to milk, not lactose intolerant. Lactaid won't cut it for me. To balance it out nicely I'm also allergic to soy. All the Protein Shakes out there I've seen appear to have soy or milk bases, or contain soy or milk solids, both of which will make heave big time, in addition to turning me into the person who looks like they just rolled through the poison ivy patch. Are there any shakes or powders out there that don't have these bases or am I out of luck?

Wow that sucks. Maybe your surgeon won't put you on the shakes and instead have you on low calorie foods for your preop. Things like broccoli, cauliflower, zucchini, etc. I'm not sure of any shakes out there that don't have those ingredients but I imagine there would be, they can't not have any shakes for people with allergies.