Im getting a weakening pain in my right leg when I swing it back & forth. I cannot do any speed on it, so im reduced to a slow plod. When I start to jog, it takes me a few strides for that weakening pain to go, and even then it is still not comfortable. Its not a very hurtfull pain, but more of a weakening pain. getting up the stairs can be a pain too. Pain seems inside the very top of my right leg. Before my holiday I was running fine, after, this pain. Any experience of this?