I can sympathise, I had a healing crises myself having received Scenar treatment. However the best person to ask is the practitioner her/himself as they should be able to fully explain to you why this happened. Very often - specially with Scenar treatments - lots of layers conjunct with the ailment you are treating can come to the surface, which you might find have nothing to do with it. Maybe look back where excactly you were in your life, your specific circumstances right at the moment of the accident. The Scenar touches on all levels emotional, mental, spiritual and often physical as the last one!. The fact that your ancle improved better than expected says something.
I suggest to have a good talk with your practitioner and yes I certainly had to continue through my healing crises. It is like a volcano that arrupts, you can't just stop it now.
Hope hat helps