I Have Been Having Trouble Sleeping For The Past Week

I have been having trouble sleeping for the past week or so. I go to bed about 10:00pm and get to sleep fine. I then wake up about 3:00am having difficulty breathing. My sinuses feel like they have swollen. I feel fine otherwise. When I get up it tends to ease up, but not until I'm up and functioning for the day does this go away, then I'm good for the day.
Over the past 6 months I have gained about 15 lbs. I am now working on losing this weight.
I also have a major deadline at work, and am moving next week. Not sure if this is some anxiety.
Any thoughts?