First time

Last night I tried to LD for the first time. I found that right as i was getting some results and seeing some dim light and feeling waves of light; my heartrate started to skyrocket. although I had a cool head, my body sure didnt think so. This prevented me from really entering any state because my breathing got so rapid. eventually i snapped out of it kinda frustrated. any sugguestions as to how i can control this? or is it something thats going to happend that i just need to condition myself to accept? Thanks!

Accelerated heartrate is a symptom of oncoming SP. I take it you were trying to WILD? Even so, there's not much I can suggest, since I've never experienced that feeling. Try concentrating on your breathing a bit more, hope that it isn't recurring, or try, try again until you adjust to the shock.