Scared on a Saturday morning

It's about 6:40am on Saturday and my anxiety has again gotten the better of me.  I went to bed at 10:30 so as to get 8 hours of sleep and was doing just fine until the 3-4am hour when I was up and could not get back to sleep.  So of course I start freaking out: will this affect my run?  Am I going to get sick?  And the general: am I going to freeze my ass off out there today?  I was able to fall back asleep, but then started waking up every 20 or so minutes from 5am onward to about 6am...finally getting out of bed at 6:15am.  Hoping the 4 mile run in cold weather (27 but feels like 17!!!) today won't be so bad.  I'm sure once it's over I'll feel spectacular.  I just have to get there...I did down 2 pieces of toast with peanut butter (my trainer's recommendation) and some water, so I am fueled up.  Let's do this.