Check out my diary.....Should I worry?

You don't eat nearly enough - you should be netting at least 1200. And 15-20 lbs in 3 weeks is not realistic. You should be losing 1-2lbs per week - so 3-6 pound in 3 weeks.

You want to lose 1lb per DAY for 20 days?

not possible to do healthily imo

And you're diary just shows that you are trying to starve yourself - you're body will adjust and lose muscle rather than fat, slowing your metabolism and weight loss, and eventually causing serious health issues.

Follow MFP's guidelines, eat what it tells you to, and aim to lose in a sensible time frame!

As other people said, you are eating way too few calories. To maintain basic metabolic processes without your body completely breaking down you need at LEAST 1000 calories a day. And with surgery, additional protein is critical for a healthy recovery. If you are feeling too full on the volume of food, find some things you like that are more calorically dense (eg. heart healthy fats). If you have the luxury of consulting with a nutritionist, it might help to do so.

1-2 pounds of weight loss a week is healthy. For most of us, it didn't take just a couple of weeks to put on the weight....

It's not that you are eating wrong, but you might want to re-examine your protein intake like others suggested. What type of surgery did you have? Are you able to do arm exercises, legs or maybe an easy yoga position? Our goal is not to burst your weight loss bubble but I think many of us have been in your spot and learned a thing or 2. Plus when you are ready to exercise again, your body might not be ready as it lost muscle vs. fat and you may become fatigued faster. Have you talked to your surgeon about what you should and shouldn't eat during recovery?

You are definitely not eating enough. I was was over-restricting at one point and, after developing some issues, I started to see a nutritionist. She explained to me that when you aren't eating enough for your body, you body starts shutting down various processes in order to survive on the small amount of nutrition you are providing. The first thing to slow down is the metabolism, which is why you aren't feeling hungry. You definitely need to eat more!

You body is in fight or flight mode. Eat 1200 calories. Simple.

I agree with Ready2Rock206, Raynne413, and jennaworksout - you need to up your overall calorie intake. What you are eating right now is fabulous - your breakdown of protein, carbs, and fat looks really great and you are making healthy choices with lots of fiber and vitamins! - so just do a LITTLE bit more of that! Even most extreme weight loss plans put people on between 13-1400 calories per day, and your days look like they are coming in around 1000. Give your body a little more nutrition, and lots and lots of water, and you'll be on track to hit your goal soon! I also agree that while you can't go really hard on exercise due to your surgery, try your best to keep moving in general. Walking if you can, or swimming (if your doctor says it's OK with your incisions), and some general stretching and mobility exercises to keep your body primed for when you are able to get back to working out!