Hello, I Was Wakeboarding And Landed Quite Hard After A

Hello, I was wakeboarding and landed quite hard after a jump. My ankle didnt roll it just had instant pain when i landed. It has been 6 days now and the swelling has not gone down with icing. It has been xray with no break. there is no heat in the ankle or lower leg at all even though it is swollen. should it be strapped ? should I have an MRI ?

Thank you