First off I apologize for the delay in response time, it seems your request may have been put in the wrong category which is why there was a delay in reply.
I would be happy to share my interpretation with you. Remember I do not anything about you or your current life situation which could change the interpretation.
From what you have described I would interpret the entire dream sequence to a feeling of being very overwhelmed.
In the dream it appears everything is falling apart (wood raining from the sky). Somewhere in your subconscious you know there is a way out (white carriage) and you desperately want a way out.
You seem to realize the consequences of not overcoming whatever issue may be going on and this is interpreted by going down the elevator and everyone is gone. This could be interpreted as death or your life falling apart (going down) and no one can help.
In your life are you and your husband having a difficult time, perhaps with a finances or family? I got a strong feeling of you being overwhelmed and scared of the consequences of loss and also sensed you may be in a state of disbelief.
Almost as if you cannot believe you are in this situation, everything is falling apart, you know there is a way out but cannot reach it and if you do not then everything will fall apart and/or you will die.
Again that is just my interpretation from what you have described. If I knew more about your current life situation it could change what I thought of the dream and of what everything represents.
I hope this helps.