How are you "going to the bathroom", per se? When you fast for three days or longer the natural urge to go is gone, so you have to get things out on your own. Enemas and lax teas are good ways to do this. Have you been doing any of this?
Note: It's not uncommon for people to think they can fast for over three days and not have to get the crud out of their system. Many people don't think about this absolutely essential part of fasting.
The reason why it's essential is because you have begun a major detox/cleanse cycle. You're releasing mass amounts of stored up toxins in your body (stored in joints, cells, organs and intestines themselves) and they must get out. They leave three ways: skin, bottom or mouth. If there's no desire to go because of lack of digestion and you're not giving your intesines a way to flush, you're body will force you to throw them up. This is usually the point where you've just made yourself sick with your own toxins. You're basically soaking in toxins. NOT a good place to be. This is what I mean when I say you could mess things up if you don't eliminate.