Nupine, I want to say in advance please don't take this the wrong way.
First of all, GET BETTER GIRL! That being sick stuff stinks and I'm sorry to hear it! It makes good fod choices harder to make as you're just going to settle for what tastes "ok" and stays down!
I haven't said anything before as I tried to bite my tounge because I didn't want to be the bad guy. But it seems as if it may possibly be starting to take it's toll so the nurse in me can no longer go without saying something to prevent it from getting worse.
Everytime I read your posts I am very excited for you and you're weight loss. Though I think I am correct in assuming you are a teen? And you're posts tell me you diet like a teen. Nothing wrong with that ( I did it myself) but it really is not good for your body in the long run, and eventually, you will gain some if not all of the weight back. Especially as you age. I know that you are not starving yourself, but at the same time- you are. As what seems like a healthy fairly active teen your posts of your daily consumption are NOT enough for you to maintain your health and could quite possibly be the reason you are sick. I understand it seems the problem is you need to eat less. But if this is less. than you need to eat more! The problem is you need to make healthier choices in the foods you eat and eat more of THOSE. It's not so much how MUCH you eat, but WHAT. And like I said, I dieted just like you when I was your age and it works. But it will come back as soon as your body starts either a) going into acidosis and depleteting your nutrient reserves to maintain your health, or b) you start eating normally again. For example, not having "much" (sorry I can't go back and quote all the exact things you said) but eating pie for breakfast and a frappe for a snack etc...is not healthy in any way shape or form. Agreed, you're not eating much so yes you're going to lose weight, but you're also filling your body with (pardon the expression) "crap" instead of the nutrients you need.
A diet really should be a lifestyle change, NOT a diet. Those are the "diets" that work. You're last post or two I was glad to see you have at least thrown some vegetables etc in and I'm glad you like your chocolate milk (you can probably thank that milk for keeping you as healthy as you have been through all this) you also will be lucky if the imbalance of nutrients doesn't put you into an electrolyte imbalance such as hypercalcemia. Also, processed vegetables like the V8 are very high in sodium and also are not meant to be a replacement for your daily vegetables as it still lacks some nutrients you get from fresh vegetables (I believe they may even say that on the can). The fast food foods, no matter what you get are high in fat unless it's a salad with low fat dressing and no croutons etc. Your weight loss of 11 lb is amazing, however that is WAY too much for 2 and a half weeks. COMPLETELY unhealthy and like I've said is probably partly to blame for your immune system being down.
As someone who has dieted since I was 14 and like you never been "obese" just a bit more curvey than a lot of girls, I wish someone would have smacked me up side the head and told me this when I was your age. But to me then it was all about the "quickest" loss possible. I figured I'd deal with the rest later. What I didn't realize was that quick loss, tended to make me gain more in the long run bc my metabolism had become shot. I really recommend working more on getting a good healthy food in the amt of servings you need from each of the food groups (nutritionpyramid.gov is a great site for this) and I know it seems like I'm just being a nasty know it all adult and you don't want to even THINK about putting any of those pounds back on (as you may well do the first week or two of eating more healthily) but it really is the most healthy way for you if you are at all concerned with your long term weight and overall health. I also would suggest taking a multivitamin daily as this will help with the illness prevention and keeping you energy up and metabolism functioning as it's supposed to. And drink lots and lots of water. It seems you probably dont like water too much, but there are SO MANY low calorie options to put in drinks out there now- just try to find one! And you can always make iced tea or lemonade!
Once again, I hope you dont take this as offensive, I am hoping it will help you in the long run and save you MUCH headache and problems in the future. If someone had told me it REALLY WAS all about a balanced diet and excersise when I was your age I would have lost of all this weight years ago! Good luck, and if you have questions or need suggestions or whatever, please ASK! I would have no problem trying to help you reach a healthy balanced diet!