HELP WITH BP MONITOR?

alright soo, i was at the doctors today and the nurse said my blood pressure was pretty high. & this is the second appointment that it has been higher than usual. i think it is probably because i totallly spazz out when i am at the doctors, but anyways... i explained that to my doctor and she didnt really seem too interested in what i was saying and said that i have to be sent to a doctor that specializes in blood pressure etc. so i was arguing with her that i know i dont have high blood pressure. so she said welll, maybe you have "white coat syndrome". i had nooo clue what that meant so she went on to explain what it is. so then she suggested that i should be put on a 24 hour blood pressure monitor.. and i am going to go to the hospital in a week to be hooked up to it to determine if i have hypertension or if it is just anxiety... so pleeeease help me!!! should i be scared? does it hurt? and also i am worried about sleeping?! when i am asleep will i wake up every freakin time it goes off?! ahhhh!!! THAAANKS SO MUCH!!