Seven years ago I was preparing for my chemistry examination when I suddenly felt very uneasy. I felt like getting too conscious and like something came to my mind and I went blank. I became very afraid that I would feel like that again. I keep getting that feeling of unknown fear again and again till now. I don't know if I will ever get rid of this. Can I do anything to become normal again?

It may or may not be an anxiety attack, but I suggest you see a doctor to make sure and find out the facts. That's where you start.