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Hi and thanks for the query.
Ankle twists usually cause ligamentous injuries and that causes the swelling and the pain. You are doing the right thing by keeping it elevated and icing it. I would also advise that you apply Ibuprofen liquigel thrice a day with gentle massage on the ankle and keep it covered with an ankle brace available in pharmacies. You should keep it elevated above the level of the heart, on at least two pillows while you lie down and on a couch while you sit. Avoid load bearing for now. And start on an anti inflammatory medication like Aleve 200mg twice a day for pain relief and early resolution. If the leg feels colder then you should get an examination by your PCP and a doppler ultrasound to rule out vascular insufficiency meaning that the limb could be underperfused. This is the most common reason, the other reason is peripheral neuropathy or nerve injury which is probably not the cause in your case since that usually affects both the feet simultaneously.
Let me know if you have further questions.
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Wish you good health.