HELP!!

I have a big need. I was in the office today and went to open a document on my computer that I have been working on. When I went to open The document I found that the entire file it was in was missing. This is very bad because this file also contains ALL the work I have done since August. I have no other copies of it. Please pray that I can some how recover this file. It is almost 2 gb of documents! Also if anyone knows some way to recover files from the trash on a mac please write me at: Howiehilljack@gmail.com