Is this serious? is it a panic attack?

Okay so i was on the laptop typing to my friend on my game then all of a sudden i feel something wrong in my body system, then my face went numb chest and hands, i think my whole body went numb. i was feeling tears going down my face and i was breathing heavy and fast and got light headed and on my chair i felt like was going to black out, i started seeing darkness, i trembled to my bedroom and scrambled out on my bed, panting and still numb 5 min after i fought it away i think, and it's been an hour but i feel tired and week. my parents aren't home i don't know what to do is it serious? what would've caused this?