Meat addiction

Recently i saw a movie about animals and how they are treated, and later turned to food. Needless to say it changed me. I couldnt eat meat and not think about this movie. So i made a decision - to become a vegetarian. First days i felt fine, after that i felt weaker, but somehow better. I thought it was normal and soon my body will get used to it. Now the strangest thing and my problem. After week some usual things happened - my legs and hands were sweating all the time, i had mood swings. I was super happy for nothing and depressed for nothing. Also i had something like a fear, hard to explain, but my heart were working very fast and i felt unsecure. I have never felt something like that. I also was cold and wanted to sleep all the time
Now i have eaten some meat and feel much better.
What is wrong with me? I thought i could live without meat? I am 20 years old male with no health problems.
Can i try again or is it really dangerous?
Yes, and my food is ballanced. When i stoped eating meat, i ate as many vegetables, and all other stuff, as i could. And i do drink milk and eat eggs.