I am SO nervous for a date on saturday. My anxiety is starting to interfere with my life. How do I calm down?

I have a date on Saturday with someone who I have been interested in for a long time but don’t know very well. I’m super excited, but also extremely anxious. I’m shaking all the time. I can’t sleep. I’m sort of nauseous. I keep thinking about what I want to say, or questions I should ask, or how I can make good conversation – instead of focusing on more important daily tasks (like work). This usually does not happen.

To put it simply, this sort of stress is having a negative affect on me. I wish I could flip a switch and just chill out, but I can’t. Maybe the good people of Fluther can lend me some perspective or provide me with tips on how to relax – not only so I can go on with my life, but so I don’t come across as a babbling fool on our date from all of the pressure I keep building up.