what is the cause of full body cramps espicaly severe cramps behind both knees and it turns in my ankles even my upper front of legs thigh area and cramps of the arm by the humerous when I awake to walk I feel like I have not enough strength all over my body to carry my weight and I am so very tired that I fall asleep anywhere all day and night thank you oh yes the cramps are so bad they wake me up and last at least a hour more or less help please