I Have Severe Muscle Spasms At Night And Now When

I have severe muscle spasms at night and now when I lay my head down at first it feels even my brain is taking one for a few seconds. Getting no sleep They are very painful! At the end of my rope My family doctor has not found a cause for them yet I have had lots of chemo and radiation and wondered if this had something to do with it. I have had AML three times