Welcome to HCM
We understand your concerns
From the available symptoms, it might be a simple sprain
. You did not mention your age or how this happened. Age related bone problems such as osteo arthrities can cause swellings and burning pain and cold
water relief. Or urea deposits in ankle are can cause the pain and swelling. Or it may be simple sprain.
But you need to confirm, especially if you are above 40. Do consult a generl physician and confirm.
Get well soon.