Hello. My Name Is Paul. 54 Years Old. 5' 8"

Hello. My name is Paul. 54 years old. 5' 8" 170lbs. When I sleep I am awaken by extreme pain in my left shin that travels down the front of my shin and into my ankle. My ankle is ceased from the pain making my muscles cramp so bad that I can't stand the pain. This happens almost every night. The pain is a ten that lasts about 20 minutes. My calf muscle is sore during the day from the severity of the episodes. Any ideas? Thank You.