What is wrong with my leg so painfull?

You may have developed a traumatic hematoma - hard to discern because of your *bad* typing or English - but with all the brusing and the popping sound, swelling - you might want to go back to the ER or your primary MD to get it checked out to see if it's a hematoma that needs drained or something else, espeically if the pain is getting worse after 2 weeks.