All of a sudden i start feeling like im going to pass out & my heart beats fast. They come out of the blue & last a while, also, while they are occuring i feel extremely spaced out. Is this normal? Is this an anxiety attack? Also, when i dont have these ‘episodes’ i feel spaced out. Is that normal?

All of a sudden i start feeling like im going to pass out & my heart beats fast. They come out of the blue & last a while, also, while they are occuring i feel extremely spaced out. Is this normal? Is this an anxiety attack? Also, when i dont have these ‘episodes’ i feel spaced out. Is that normal?