Definitely check with a doctor about this right away.
I'd say:
-Ditch the sugary drinks, the only thing you should be drinking is water (3 litres, roughly 13 cups daily). Instead of drinking 1 litre of water at a time, always have a cup of water by your side wherever you are and sip from it throughout the day. Ditch the junk food; healthy, whole foods taste better anyway.
http://health.howstuffworks.com/usda-weight-loss-tips.htm-Get yourself into
daily cardio for at least half an hour a day (wake up earlier if necessary and do it in the morning) and move to HIIT when your joints can cope with it. Do something you find fun, that way you'll stick to it.
-Buy a cheap notebook and use it as a food and exercise journal. Write down everything you eat from now on and monitor the calories of
everything that goes into your mouth. Cut down on high calorie foods. Also, find out the GI of the foods you're eating and only eat high GI foods around the time you exercise. If you can, start a photo journal too. Take photographs of your whole body from the front and side, only wearing shorts, weekly. This way you'll know for sure that you're losing fat. Taking waist measurements is also a good idea. Don't bother with measuring scales, your weight is not a good indication of your bodyfat levels and you could be losing water weight, rather than fat when you see those numbers go down.
-IMPORTANT:
Don't starve yourself, this will cause you to retain your bodyfat because your body will go into starvation mode and if it does, you'll put on all the weight you've lost through diet and exercise. This is the reason why your two days don't last, it's impossible to eat that little on a daily basis, given your bodyweight. GET REAL, eat a healthy amount for your bodyweight, at 300 lbs, you should probably consume something like 3100-3300 kCal daily to lose weight (this amount will reduce when you lose weight). Eating less than this is unrealistic will only cause you to retain your current bodyfat. You've got to learn how to eat healthily and sensibly. You can eat in such a way that you'll feel satisfied with what you eat and you won't feel hungry. Eating more vegetables and more lean meat is the way to go. Switch to whole grain (
not "whole meal", "multi-grain", "stone-ground", "100% wheat", "cracked wheat", "seven-grain" or "bran") foods and cut your carbs down to approximately 30% of what you eat. I'd suggest getting most of your carbs through vegetables and oats (no sugar added).
(I got the daily calorie requirement from the book "Nutrient Timing" by John Ivy Ph.D. and Robert Portman Ph.D., which is roughly your bodyfat in lbs * 11 (for men) kCal daily)
http://www.healthcastle.com/whole-grains.shtml-This is a change of LIFESTYLE. You must understand that if you change the way you eat and your schedule to exercise, it will be
for the rest of your life. Many people have trouble coming to terms with this and that's why they end up quitting halfway to their goal. Don't let that happen to you, either you're going to change the way you live for the rest of your life or it's not going to change at all.
-Make an effort to
WALK everywhere you can. I mean this, I walk 20 minutes into town and 20 minutes back every day for groceries, lectures, etc. If you can't walk, get a bicycle. Also, take the stairs instead of using a lift. Simple things like these expend calories which can make a big difference in the long run.
-Realise that this is a VERY IMPORTANT decision you've made to get back to a healthy weight and you are definitely right for making it. Do not go back on your decision no matter what, there are many people who admire this kind of decisiveness and when you do manage to lose the weight, it will reflect greatly on your character. Write down all of the reasons why you want to lose the extra fat on a big piece of cardboard and blue-tack it onto the wall opposite your bed so you see it every day when you wake up.
-For motivation, get yourself a copy of Oprah's new DVD and watch the "weight" section of the DVD (I'm not an Oprah fan but the "weight" section is amazing).
If you're serious about losing weight, you'll do at least what I said above.
P.S. I'm not a health professional, what I've said is based on my own reading and you should see a doctor about this immediately to discuss what I've said and what other people here say.
Also, please post us a REAL daily consumption, not some special sequence which you prepared for us. You've indicated that this is not how you normally eat. The only person you're fooling by posting these two days is yourself.
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