Since you have frequent ankle sprains and have constant pain for 2 weeks, you have to go for X-ray to rule out any kind of minor fracture
. To get rid from the swelling keep the leg elevated as much as you can, wipe an elastic bandage
on the site, take complete bed rest
and don't wear weight on the ankle.
In recurrent injuries of the ankle MRI is advisable to known the extend of the injury
to the ligaments. Consult your doctor and discuss it.
Best Wishes and have a good health