i'm assuming this happens from excitement. the only advice i have to you is, once your in a LD, before you do anything try to calm yourself down. if you can do that, your home free.

my first LD was about 5 minutes long because right when i realized i was dreaming, i made sure i was calm before i did anything else (it was a DILD). i actually felt dizzy for a while, like i was going to wake up, but i shouted "increase lucidity" which, oddly enough, worked. :/