How do other people deal with losing theyre familys?

A couple years ago my family was killed in a car wreck. since then ive become pretty much a drifter of sorts. we were finacially stable and happy together. ive sold our home and i just move from job to job, place to place. i cant seem to get past this. ive talked to councelors psychiatrists and even clergy. i feel guilty for my wife having to drive that day.