wierd, what can it be?

**Please Help**

...about a year ago a got into a small accident which my (drivers side) front fender area to all the impact. Ever since that I felt my suspension was wierd. I tried do donuts a few months later (in a empty parking lot) and it felt like I was riding a horse its kind of hard to explain, but while im doing the donut it feels like its rocking. Ohh, and before the accident my car use to grip pretty good and would oversteer instead of understeer. Now(after the accident) its the complete opposite! I know something(s) f***ed up, but what can it be (possibilities)?