You are either having a bad reaction to toxins being suddenly dumped into your system or else you have a serious electrolyte imbalance due to throwing up and not getting enough water. If you continue to be unable to drink anything, if you keep vomiting, or if you begin to have black out spells, then you need to get to a doctor and have your blood tested for electrolyte imbalance. You should never, ever drink tea, even green tea on a fast, it tends to be diuretic and takes too much water out of your system. Vitamins should also be avoided when water fasting. During a Water Fast the body chemistry changes and some vitamins will react differently. Nausea while taking vitamins is very common, the body simply cannot absorb some of them while it is fasting.
My suggestion to you would be to juice some fresh lemons and add about 1/2 cup of juice to a quart of pure (not tap!) water. Stir in a pinch of salt-sea salt it you have it and add a couple of tablespoons of sweetener, it can be honey, Maple syrup, cane juice or even plain White Sugar . This makes an excellent homemade electrolyte replacement drink. The lemon juice provides potassium and magnesium, the salt has sodium and the sweetener makes sure the body can absorb it. The entire quart of drink only has about 100 calories, so don't worry about weight gain. If you lost 4 pounds in a day, you can be sure it is water weight, you cannot lose 4 pounds of fat in 24 hours. You need to replace this water and the important minerals that were flushed out with it.
You can break your fast with either juicy fruit or fruit juice. You can dilute the juice the first day if you need to. Dr. Joel Fuhrman suggests breaking the fast with either fresh oranges or water melon, eaten a few bites at a time every few hours. This is a good method and I used it to break my fast last week. It will help get your digestive system working again and aid in your first bowel movement.
The story about a man dying from eating fruit after a long fast comes from the book "Rational Fasting" by Arnold Ehret, he tells of a man, a heavy meat eater, breaking a fast with dates. The heavy concentrated Sugar in the dates apparently killed him. It amazing how this story in a book first printed nearly 100 years ago has become kind of an urban legend with so many people claiming first hand knowledge about this poor man.

Hi Seree,
I'm glad hopinso responded to you. I agree with her about the electrolytes. I hit the "send mail to seree" button and sent you a message to that effect earlier, but maybe it went to never never land. God bless.