Hi i twisted my ankle 3 weeks ago i'm still in pain, and sometimes my whole leg feels heavy! it almost looks like my ankle bone is stickin out?

Torn ligament: You may have a torn ligament in the ankle. Get an xray and may need a boot or cast to help heal the tear.

Tendon issues: Some of these long standing ankle sprains are not ankle sprains at all. Posterior tibial tendon issues will give ankle pain, severe swelling and a falling of the arch making the tibial ankle bone seem to stick out.

You need X-rays : You should have it evaluated and x-rays are a minimum. See a podiatrist.