I am beyond frustrated and in tears.

I also wanted to offer my condolences on you loss.  I can't imagine how hard it is to go through major surgery and then a loss like that.  Take care of yourself.

One thing that helped me early out as far as feeling the restriction was to remind myself that the goal was to be satisfied, not stuffed.  No matter what I felt or thought I did or didn't feel after eating I just asked myself if I was satisfied and surprisingly I was. 

I am still surprised that such a small amount of food can satisfy me.  In the beginning it was almost a game to go to a restaurant and order something that looked like it was too little food and see how I could eat that and not feel deprived.

Even now I will serve my food and tell myself that it doesn't look like enough and I tell myself that if I am still hungry I can always go back for more.  I have never had to.