I have just been reading some of the comments on here and some of the other girls have said the first 3 days are the hardest.
So stick with it, you are just about past the hardest part.
I've been reading the December 2015 thread, you should check it out. It has just made me decide to start the Optifast tomorrow. I will also do the same as you, 2 a day plus a healthy meal.
Any weight loss before surgery is going to help us and I suppose help the surgeon help us. We can do this!