Last night I had a panic attack and it was terrible, I took a hydroxyzine and it did nada to help me. The problem I began to have is every time I would close my eyes to sleep I would have thoughts and images in my head and then just as I would start to doze off I would awaken with my chest beating and  body trembling.  This continued all night and day, I've yet to sleep and scared to death I won't be able to sleep tonight. Has anyone else experienced this and any advice on how to overcome it?