Don't worry about being depressed or what has gone on in the past. but you can do something about what happens from now on.
I do recommend that if you have suffered in the past from depression, you too will probably respond to counseling.

When we suffer trauma and are medicated it inhibits our ability to process daily. You have suffered something very severe, you need reassurance and help to dissect the accident and the continuing effect it has placed on your life.

If you have a close friend who will sit and listen, use them. But a specialist councilor will help the most because they are trained to help us draw the right conclusions.

However so as not to feel inadequate in your own ability to control your own emotions, maybe start a simple diary charting what you experience daily, how it makes you feel, and the reasons you think these experiences make you feel the way they do.

This will help you to keep a check on yourself and not allow your emotions to run away, like they may have in the past or may seem to be doing now.

Sleep is important but so is a tiny bit of exercise. Listen to your body and work with it.

Do not let the depression control you, take control of it.