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The ankle is a very delicate region with potential severe complications following ankle trauma. Ankle trauma can result to various pathological entities ranging from sprains to complicated fractures
that can bring disability
The rapid evolution of your symptoms indicate that there its a serious issue needing immediate attention. It could be a trauma to an ankle ligament or even an ankle bone that is affected.
The most feared condition will be a fracture which dis-stabilizes the the ankle joint ( such as pathological variants of the bi-malleolar fractures) as it will require surgery for correction less you will develop a disability.
What is important to do now is to see a doctor for proper examination and at least for an x-ray to rule out fractures and or dis-stabilization of the ankle joint.
Best regards and wish you a speedy recovery.