Hmm... not sure if this is allowed here.
Oh well. Some tips I've been given for when I have writers block is:
1) Open up a document or notepad
2) Write the first thing you plan on saying without thinking about it too much (If you are stuck for over 5-10 mins, either write the current thing in your mind or skip that piece of dialogue/description, maybe putting a small note of what it is supposed to be important for)
3) Take a look at what you have written. If it is useful, polish it up and use it. If not, get rid of it and try again.
That technique takes a while, and may result in less sophisticated or a different style than what the rest of the story is.
One I use for descriptions is:
1) Get a picture/song/etc. that is related to what you are writing about.
2) If it is a song, listen to it while writing -/- If it is a picture, look at it while writing (yeah not very helpful, but works)
There are a lot of tips online for writers block, so maybe a quick google search could help you find one more suited for you. You could open up a notepad/word document for a few minutes and write random things for a few minutes to clear your mind. Not sure if that would really work, though.