i wonder if you have a torn muscle? it doesn't sound like a cramp to me. a cramp is when your muscle tenses uncontrollably and feels like it's trying to tear itself apart. if your muscle tenses it could be a cramp - in that case try hydration gentle stretching calcium and either gatorade or pickle juice.
leg cramps. i am having very sharp pain in my upper left thigh for about a week now - since my last workout. the pain is not constant it comes in waves and feels like burning for about two seconds then goes away. it's getting stronger. could this be a cramp? it's a small spot on my thigh about the size of a golf ball but very concentrated.