My subaru feels like its driving on ice and front end is swaying why would it?

What is your question?

The problem started after dropping my boyfriend off at work last night. I went to leave his job like I normally do but my car hasn't felt right until I had my mechanic replace my harmonic balancer a couple days ago. I have replaced the ball joints, tires (countless times), belts, pullies, air filter, sway bar links, radiator, alternator, headgaskets, battery, fluids checked and topped off. If anyone has any ideas please I'm open to them all

What makes this problem better or worse?

When I'm driving its worst

How long has your 2006 Subaru Forester had this problem?

Last night it started