Totally think you should, I think that you have ample reason to feel depressed and it would not be difficult to accept that although you were not feeling suicidal then it has been on your mind as you come to terms that you have moved beyond those feelings. So when you were faced with the sudden tradgedy and not having the emotional support you needed that your mind has returned to the thought of suicide.
Distraction is one way of seeing yourself through is there a friend or family member you can go and stay with for the night?