Sprained ankle still after 6wks

sprained my ankle 6 weeks ago . The Dr gave me a boot and a brace as of recent . I haven't been able to wear the brace because it not very supportive . I stand/ walk 8hrs of my work days and it getting to point where my other leg hurts with amount of pressure I put on it. Now both of my legs and feet hurt . I try stretching and using ice to compensate. My sprained ankle is my right foot so I am not comfortable driving . Overtime It gotten better ,but still is swallon and has look like has fluid retention. I am getting an MRI next week. I am just very concerned and frustrating because I want to get back into fitness .f 28. Sometimes I get random pain and I hope it not nerves .. it hard walking without the boot on regular basis.just hope I don't need surgery
Also the back of the foot hurts like all sides