This is going to sound pretty straight forward but: It sounds like their is still something "wrong" with your ankle. It sounds like you walk on the outside of your foot because of the pain through your heel.

If there is still pain when you are using it "normally" it would be fairly safe to assume (without assessing you) that your ankle has not healed completely, or alternately - that due to the layoff from normal exercise/sport that other structures in your foot have become stiff.

There is a structure called the plantar fascia that sounds as it has become irritated - i would suggest seeing your physio so they can assess and treat this problem properly.

Cheers