An outward roll of the ankle may cause immediate pain and swelling, so an eversion injury is likely. There could be mild fractures or other problems missed by the initial examination or X-rays. I would advise you to get it checked again, if not much progress has been made in the next 3 weeks even while using an air cast for support.

Its not like that. Any selective Cox2 inhibitor will do the job.

You may be suffering from a blood clot in your leg as a result of the accident. Injury to the leg causes blood to pool and form a clot causing swelling, redness, and pain. This is serious because the clot may break free and travel to other parts of your body. Elevate your leg above your heart, apply ice, and take a break. When the pain persists or becomes severe, go to the nearest hospital immediately.

The injury that you have described might be a muscle strain or a cervical nerve compression. You should consult an orthopedic doctor or a neurologist for proper diagnosis and therapy. If the pain lasts or increases, do not ignore it.

The MRI results closest show some mild desquamation of the joints, which may cause swelling and pain. The swelling in your extensor digitorum brevis muscle could be possibly related to the joint issues. Avoid these movements at first, put ice on them, and try stretches that don't need a lot of force. Besides that, you might notice a difference if you wear supportive shoes.