Walking under ladders is supposed to be unlucky, not climbing them. I am so sorry again. My computer misbehaved, that is why there was a delay in my reply. I apologize. Please understand that online, no one can state anything with 100% certainty, all I can offer is my best educated guess based on what you've written.
And from what you write, I do wonder if you may have broken not your leg (though thats not outside the realm of possible), but your tailbone or coccyx or maybe even a vertebrae a bit higher. That would indeed cause pain on walking, and bending would be painful as well.
That you have no numbness or tingling in your legs, and that you have normal urination is very good, it tells me that as of now, if there is a break, it so far is not impinging on nerves. (The nerves that control the bladder are come from a higher vertebrae than the tailbone) But I cant be assured that you do NOT have a potentially dangerous break which could affect the nerves in your legs.
I am giving you some more information on tailbone injuries. It says that injuries to this area generally do NOT need to be seen in the ER. I am going to strongly disagree, because I do not know what you did or where you did it, and the potential for real damage is very strong if there is a break above this area. So, I DO think you should head to the ER to get this checked out...just to be on the safe side. Its been five hours and you are still in such pain. While muscle strains are painful, and you may have wrenched a muscle or two, I cant, online, take that chance. So, please go to the ER...have someone drive you.
Further Information: http://www.webmd.com/fitness-exercise/tailbone-coccyx-injury
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