Ok, so you're sitting there, nothing is coming to you, your mind is a blank. So instead of trying to force yourself to think of "what happens next" why don't you do something silly instead?
I was messing around with some work mates filling the Inbox of a colleague who had the nerve to be on holidays while we were at work. So we were just sending stupid emails back to each other for the sake of it. I thought I would mix it up a little and try to include words starting with the same letter in different emails. The following gibberish is the result:
I've been frequently frustrated by my foiled and failed attempts to provide forthwith a flurry of furious humour of what would no doubt be personal faux pas, instead I'm forced to resort to fabricated follies of flatulence.
Well I wouldn't want to prevaricate on the possibility of procrastinating positions of power with the prevailing pervasiveness of posturing by prominent pedestrians in the halls of this place.
Do you think the culmination of consecutive correspondence may have the consequence of convincing her not to continue her crusade as a contributor to our all conquering cavalcade of curiously compulsive contact?
What did I discover by doing this? It's a great way to take your mind off whatever it is you are struggling to work out! The rules are simple, a silly sentence using words that start with the same letter preferably of multiple syllables. Try to avoid using a thesaurus if you can so you are flexing that mental muscle to the fullest.
Give it a go, you get to waste a little time and you might actually have a chuckle in the process.