I have itching all over my body.?

for about the past three moths, every time i go to a party and get drunk, i wake up during the night scratching and when i wake up all my body is red and itching like crazy, ther's nothing i can do to stop it. the only part where it doesn't itch is my face...my scalp itches as well. i have no idea what it could be and i am really worried. the itching lasts for about a week after i drink....and then stopps until i drink again, and the same pattern repeats itself......these has happened ever since i started drinking...which was about 3 4 month ago. i wnat the itching to go away......also i can't go see a doctor because issues with my parents.....if any doctor is reading this please help me....i'm relly scared.......also, i don;t even know what i drank...vodka, coke with ron....tequila....