Emergency advice request!

It's 8:10 pm eastern time, and I leave tomorrow at 4 pm for our regional meet this weekend in Clarion, PA. If anyone can respond to this question before I leave, I'd be truly grateful. The basic question is this: I have really worked hard this season, and got into the best shape of my peri-geriatric years (I'm 49), but 2 1/2 weeks ago I caught some kind of cold/virus from my 9 year old son, and I feel like I am still at best 65%--still have sore throat, sore body, fatigue, plus cough and congestion. I'm going to swim in the meet anyhow, but my emergency request for advice is this: How do you optimize your performance when you're sort of sick? I am more worried about the 1000 and 500 than the shorter stuff (the rest is all 50s and 100s and 1 25.) Any words of wisdom? Please don't tell me to scratch the meet--if I was feverish, I would probably do so. I'm just looking for ways to make the best of a less than ideal situation, and the swimmers on this forum have provided superlative advice in the past. Thanks in advance.