my anxiety

i can feel my heart racing. i can feel a rush come over me. i can feel it getting worse. i am shaking like a earthquake. i can't stop and it feels like i cant breath. i feel like i can't escape this attack. it makes me feel like the world is ending. i feel like the room stops.  then i cant stop breathing heavily. i can't catch my breath. i try to take deep breaths but they dont work then i do it again then i calm myself down. then i am more calmer. then my body calms down. my heartbeat slows down. then i am at a calmer state.