Swim meets in freezing water

I am actually starting to get used to waking up at 6:30 in the morning every day to swim in some freezing water! I've been doing it for about 2 weeks now and the water is starting to feel a little warmer. I'm surprised I haven't reacted to the chlorine yet. It might be because I usually dry myself off immediately after i get out of the water. Any way, my first swim meet is this weekend and I really need to work on my speed. I could be slowing down every day because I started wearing swim trunks instead of racing suits. Or I could just be a little slow.