If you get stuck with your story plot, don't panic. I say that, but then I always panic. I panic for no reason because the plot always ends up working out. What I do is I give the story a rest for a couple of days. I let the thoughts float around in my head and then, poof, an idea pops into my head. Sometimes it helps to write the thoughts into a notebook. I always have a notebook handy anyway because I usually get my ideas when I am away from my computer like in the shower or in bed.

Happy writing!