Hello, sorry you are feeling so bad, it is always kinda scary when anyone is diagnosed with a new ailment.
I was diagnosed in 2007 and when it comes to food everyone is different. Checking online for a Crohn's Diet is a good place to start. I found that food became a trial and error thing for me and I suggest keeping a food diary.
I have never taken Prendisone so I can't help you with that but I so suggest making sure that you have a good G.I. doctor that you feel comfortable with, that is key.
Try not to worry about surgery, just worry about getting things under control and yes stress can make your Crohn's worse.
I am a new member here and I have found help in all the posts and very supportive people.
I hope this helped a little, try and cheer up, you are among people who understand.