I've read this and your previous thread and I do believe you're almost ready to begin your journey to a healthier lifestyle that includes safe weight loss. You've joined FitDay, you're asking questions here so you're trying to educate yourself, you have an appointment to see your doctor. Those are good indications of your seriousness.
As others have said, eating 1000 calories a day isn't healthy, you need much more water intake, and you need to pay attention to what you're consuming. I believe your approach to eating is depriving your body of much-needed nutrients. Please continue to follow PPs suggestions, especially to educate yourself. And don't be insulted the title, but I recommend starting with Dieting for Dummies as a very basic resource. (I've used these Dummies books, and the exercise DVDs, for various subjects.) You should be able to find it at your local library.
With all due respect, though, I think you need more support and education than what the WISH online discussion board can offer you. Don't misunderstand me. I think the WISH forum welcomes you and can be a great supplement to real-life support. It's not that there aren't a lot of knowledgeable people here--there are. You've gotten great feedback from the people on just this thread.
But right now your approach to losing weight suggests you would benefit from a more extensive, hands-on support system filled with people who can be with you in real life. Your strategy for losing weight at this point seems, frankly, unhealthy at best and dangerous at worst. And an online forum isn't an ideal medium to help monitor and address such behavior.
So I suggest asking your doctor questions about health, nutrition, and weight loss in addition to those about your knee and exercise. Have your doctor recommend a weight-loss group and recommended reading material. Or join your local WW or another group who will provide you with a mentor to guide you in your journey. These groups can help direct you to appropriate resources, answer your questions, and encourage & mentor you. Or perhaps you could hire a nutritionist to help you through these these early. I think that face-to-face contact will help you immeasurably in wading through lots of information and giving you the feedback you desire and you need to make safe, permanent lifestyle changes.