I have been on Ensure diets a couple of times because of a threatened small bowel obstruction. I had a complete bowel obstruction 10 years ago after a car accident, and since then I've had a couple of partial obstructions. When that happens I can't eat much solid food, and NO dietary fiber. NONE. The last time it happened, I was 16 weeks pregnant with my son. So yeah, he didn't get great prenatal nutrition from me.

I think I was on mostly Ensure for about 6 weeks.
Incidentally, I was anorexic in late high school and in college, although that is unrelated to my bowel issues.
So my best suggestion would be to make sure you have a good therapist, because you will probably go through a lot of food issues as you begin to reintroduce food to your diet. I think summer is a great time to do it as there are more fresh foods available. Perhaps a dietician can help you as well.
Since your system is not used to solid food, you will definitely want to introduce them slowly. Try some broths first. After that you might progress to some pureed soups. Do you cook? Moosewood has some great soup recipes. You can make some extra batches and freeze them so they are readily available. I think finding some smooth semi-liquid foods that you really like (and are safe foods for you emotionally) will open your tastebuds up to wanting to eat again, and also help your body adjust.
Also, I think your mood will be helped a lot by eating real foods. I know that I just feel really flat when I have had to do the ensure thing.