Juice fast crash!

I completely crashed this evening. Today is day 3 of my juice fast. I got a headache that continued to get worse, shakey, snapping at the kids, just wanted to close my eyes and pass out. It was a nightmare. I thought I would die. I don't know if I over reacted. I have no one here to help or support me or watch the kids. My husband is out of town on business today. I broke down and rushed a handful of raw, unsalted almonds in my mouth. I think the protein was lacking. I also ate an avocado mixed with lime juice and dipped with cucumbers. I think my blood sugar was going crazy. I don't want to do a fast ever again! I want to drink fresh juices, but not have that be the only thing. Tomorrow I may start with juice, but I'll work on a raw veggie and nut diet to transition back to eating cooked foods. I'm feeling seriously run down and defeated. I know nothing.