“clunking” sound in ankle

I recently sprained my ankle in a rolling fashion. I felt and heard an extremely loud pop(s). It has been 2 weeks and I feel I haven’t recovered at a reasonable rate. If I apply any weight on that foot & then lift, there is a “clunking” feel–as though the foot drops away from the leg. I have sprained my ankles a few times before, but never with this much pain and the feeling I described. It has taken 2 weeks to finally lose the crutches. Do I need an MRI or this just a more severe sprain than what I’ve felt before?