pain and food 3 days post op

It has been three days since my gall bladder surgery,
It is obvious to me that my body has undergone a fundamental change. Even though this change has required me to experience excruciating pain at times, it feels like it is an answer to my struggles with my weight. Even three days out, I don't feel like eating much. And the things I do eat are in a very limited range. Not only do I know intellectually what to eat and more important what NOT to eat,  my body is telling me intuitively. I  can eat, oatmeal, low fat cottage cheese, cherrios, almond milk, canned pineapple, banana and toast with a small amount of jam. I can only eat about half of a serving.Im very leery of anything with any fat in it, most dairy products and meat. I don't even want fresh veggies. Im keeping track of my calories on my great weight loss website, Daily Burn, since surgery, I have eaten about 500-600 calories per day, It's as if my body is saying, 'Let's take a break from eating' . I have plenty of reserves. And I take vitamins. 
The other aspect of this is pain. For the most part the pain is bearable or non existent. However there are moments when the pain cuts through me like a knife. The most difficult thing is getting up from lying flat in bed. Ive learned some maneuvers that make it doable. But it still is just over the top when I make the wrong move, to the point where I cry out in pain.  I know it is important to stand up straight. The tendency is to bend over slightly to relieve the pain. But if I do that I may never stand up straight again. So I do it regardless. I hadn't taken a pain pill since yesterday at 4AM. But this morning I decided to take one. Hopefully I can move around better with it on board.
I will be so glad when this blog can shift focus to something besides my health. I keep it going because it is cathartic for me. And people want to know how Im doing. This is the most that I have focused on my self in my whole life. But I guess this is part of my journey.