One way to look at this situation is to get scared and stop Lding all together.
However another (more productive) way is to say to yourself 'If LDing got me this scared imagine the possibilities of the complete opposite happening' i.e. a dream so fantastic and pleasant that you don't want to wake up from it.
If your mind can create such intense unpleasent experiences it is also possible for it to create incredibly intense pleasent experiences.
Please don't let this one experience put you off, you could miss out on so much...