Ok i have a dentist question?

i am so scared of the dentist that if i even think about it i start freaking out i have lots of work that needs to be done im not afraid of getting my teeth pulled the pain anyhow but i hate to be num i feel as my throat is tight and i can not breath right when they give me that shot i feel like omg im ganna die i wanna get my teeth pulled but can my dentist only num that one tooth other then half my jaw ?