yeap I've had these too a couple of weeks ago really bad, couldn't walk for 2 days afterwards. they can be caused by blood cloth so if the pain is localised or you can see any redness on your leg definetly check with doc. I just drank heaps of water and hoped they would leave me alone. they have been a lot better, now at the first sign of them even if its painfull I grab my toes and pull them towards me so my leg is straight it really works if you can get them early they go away pretty quickly. good luck!