As recent as it is it would be called Post Traumatic Stress which is a very normal reaction... When it won't go away and go without counseling to deal with recent trauma you may go on to develop PTSD the D is for Disorder and it turns into years of living hell.

An accident is traumatic. I am sure it scared the living shit out of you! The best thing you can do is find a grief counselor or someone who works with trauma survivors. CBT may help you nip this in the bud.

Again it is normal for you to have PTS from this. Get counseling ASAP and do what ever you can to not develop this disorder. It can be prevented most of the time with proper intervention. Your incident is recent enouh yu can do this.

The best of luck and wish you well. Again get in counseling so you can work it out. Much of what is in the info may help you too and venting here.