You need to give that leg some rest, buddy. Don't strain yourself with the running. If the running can't be avoided, you may want to try Ibuprofen
tablets - 1-3 times a day, along with an antacid
prescription such as Gelusil
tablets, 2 at the same time as ibuprofen. (The Gelusil tablets have to be chewed). Get the shin strapped with an elastic crepe bandage for the next few days. You may apply a local pain killer ointment like Voveran
before applying the crepe bandage.