I'd say that if you haven't already then to follow RICE; Rest (though do move it every so often), Ice (put ice on your ankle (with a wet towel or similar between the ice and your skin) for up to 15mins every hour), Compression (put a bandage on it. A tubigrip would be great. With you saying you're overweight then a size E may be the right one if you're an adult as that's for large ankles. Definately wear one of these/ another ankle support when walking around but they should be taken off when you're asleep) and Elevation (sit with your foot up).
If there's nothing in the leaflet to say you can you could also try taking Ibuprofen to reduce any swelling (as there's likely to be some even if you can't see it) and that will also help with the pain. Take it at the dose that it says and always with food. If it's still painful with that then you can also add in paracetamol (again at the dose recommended and again, read the leaflet beforehand to ensure there is no reason why you can't take it).
If it doesn't continue to improve over the next few days or it begins to worsen then you need to get it checked out by a doctor or, if you live in England you could go to a local Minor Injuries Unit (MIU).
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