Hi.
Congratulations on your first olympic distance! I completed my first oly. distance this year as well and i get giddy thinking about it. My true freak out in OWS happend during that race since there was A LOT of seaweed in the shallower part of the lake (beginning and end of the swim). It felt like little hands grasping at me from under water and I felt my breath catch. In that situation i tried to use the seaweed as sort of an indicator to how fast i was going since i could see myelf passing them. Also, i brought my stroke closer so i was systematically pushing the weeds away from my face.
I've had other races where the water has freaked me out (and I am a swimmer so you are def. NOT ALONE). In the cases where my breathing becomes shallow, i actually flip over and do back stroke for a little while until my breathing goes back to normal.
Also, i noticed one thing when swimming around other folks...well, not even swimming around other folks, when everyone is swimming on top of you it seems, it helps to ease up on the legs until you get away from the masses. It helped me just know that I wouldn't inadvertenly kick anyone in the face and also it allowed me to get through the flailing bodies pretty gently.
Lastly my comments about swimming in the open water in general...I'm a little bit OCD like Monk on USA. Sometimes my mind wants to get all grossed out that i'm swimming in a lake/water i can't see thru. It helps to actually peg people out to pass so your focus is more on the race than on the open water, which is the only thing that helps me out..otherwise I don't think i could do triathlons!
Hope you have a great day!!!! CONGRATULATIONS again on your first olympic distance.
We have to live with the ambiguity, the treacherous impurity of everything human - Hans Jonas