Not Sleeping

Well I am going to a sleep lab tonight here in about fourty minutes. I have not slept right in a long time and it seems to be worse since my gall bladder surgery. I am afraid they are going to tell me I have sleep apnea and I will have to start using a C-pack. I don't know how well that will go considering I am clousterphobic and can't stand feeling like I am being smothered.
Need prayer that the doctors can find out what is causing me not to sleep.