What Causes Persistent Leg Cramps?

DEAR DR.
i am a male 24 years old.
i had an accident lately and had an operation in my head.the outer bone covering the temporal area broke and i had to put and artificial one instead.thankgod ,i amanged to recover.i consider it a miracle.
the doctor prescribed epanutin for 3 months (3 capsules per day) and i have beentaking it for one month but constant leg cramps are making walking very painful and hard.
i tried to decrease the cramps by using muscle relieving gels for massage and i am taking magnesium and vitamin b6 supplements to help.
i am trying to exercise and walk slowly but nothing is working.
i decided to decrease the dose to 2 capsules per day 2 days ago but still nothing better.
are the cramps caused by the medication epanutin and how can i decrease the leg cramps?
the doctor asked for a blood test but i still did not get the results but i can not wait until the results get out.
is there a way to decrease the pain and do you have an idea about what is happening to my legs.
Thank you.