Got a remedy that will work, but it's gonna sound strange. First get some Vicks vapo rub, and put it on the area that hurts. Then get a washcloth wet with water that's as hot as you can stand it, and put it on top of the vicks. the vapors from the vicks will relax it. I know it works because that's what I do when I get really bad cramps in my legs
What Mel says works. There is also a linament that is phenom. Ask your pharmacist if they carry the old Watkins--but--trust me--use it with caution. It gets HOT.