Itchy feeeeet !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!…

i have this thing when im trying to go to bed/ my feet itch, and NOTHING can stop it , ive gone to the doctors about it , all they said was to wash them before i went to bed, i do that but it still desnt do anything. i dont understand. because it keeps me from getting sleep at night when im real tired. can someone please hel[p me ? thank oh so much