Arena help pls (lvl around 38, borderlands 1, xbox one)

i need help in the circle of duty arena (the last round) i am always about to do it but then i get ■■■■■■ by a car that takes 56568186 health from me or 561652862386256568 special enemys come at me and i die and everytime i am about to kill somebody at the near death thing i need to reload…