EMBASSY APPOINTMENT LETTER!! HELP PLEASE!!!

I have my appointment at the American Embassy in London tomorrow.  It has been confirmed with them on the phone and my lawyer has been sent a letter, but I have not.  My lawyer emailed it to me (so he said) but the email was without attachments, and by the time I realised he had gone home.  Has anybody ever gone without one before?  I'm worried that they wont let me in but surely the guards outside can confirm it some other way, surely they wont send me home just because of that.  Can somebody settle my fears please as I have to get up for this appointment in 4hrs and I can't sleep for worrying. 

What time is your appointment?  Can you email your lawyer letter him know the letter was without attachments and ask him to send it to you first thing in the morning.  Maybe then you could print it from a kinko's  or somewhere similar?

I still don't know what time your appointment is, but I'm keeping my fingers crossed that this will help.  Good luck