how to stop the itching

Destiny

i went to the doctor today and they drew blood to test for cholestasis. my doctor told me that i could take benadryl for the itching because its been nonstop for a week. i don't have any benadryl at the moment but its driving me insane, i feel like im about to scratch the skin off. does anyone who has had this problem know how to make the itching stop?