Can anyone tell how can I came to know that I am in love of someone.

Oh dear: only YOU can know that! There may be many symptoms of love, such as not being able to sleep, thinking of a person often, and wanting to see a person all the time. But all these can be thought of as shallow manifestations of fondness. Are you really in love? I remember this quote from Austen's Pride and Prejudice, when the heroine Elizabeth Bennett asks Mr. Darcy when he knew that he was in love with her. He replies by saying (and I quote, albeit paraphrasing it), "I was in love with you long before I knew that I was." Or was it: "I was deep in the middle of loving you before I realized that I was in love." Sometimes, you just don't know. You just let it happen. When you wake up one day, you know you're in love.

Actually, no one can define about love. But may if you miss a lot when you are not going to meet. But may its your love, more symtoms are displayed when you are fall in love.......