Thought I'd ask the pros

Running my first sprint tri next Sunday. Up until two weeks ago I've been training regularly since the start of the year. My work is seasonal and like I expected, work really picked up two weeks ago and I haven't had the time to train like I wished. The last two weeks has given me time to run 2.5-3.5 miles about 3-5 times a week. I feel like I've withheld my cardio to be able to compete in the event. Any suggestions on how to train for the next 7 days? And one other kicker, since Friday my allergies/sinuses have hit me like a ton of bricks. I guess I need to get the first Dr appointment tomorrow and tell him my situation to see what he can do to help me breathe better since breathing is somewhat important in events like this.