SOMEONE PLEASE TALK ME DOWN OFF OF THE LEDGE!!!!!

IT'S BEEN A LONG TIME SINCE I HAVE HAD A FULL BLOWN PANIC ATTACK, BUT I THINK I AM GETTING CLOSE AT THE MOMENT. I AM FLASHING BACK TO A JIMMY BUFFET CONCERT...OR WAS IT PHISH? THERE WAS ALSO A VERY HOT HFSTIVAL WHERE I WAS SURROUNDED BY LOTS OF VERY TALL PEOPLE. AND THE RAFTING INCIDENT. NOW, I HAVE THE CHICAGO MARATHON. REMEMBER THAT MARATHON I HAVE BEEN TRAINING FOR? PROBABLY NOT, BUT I JUST DID! YES, I HAVE BEEN IN DENIAL. I REFERENCE IT OCCASIONALLY BUT I DON'T REALLY TALK ABOUT IT.
Okay, deep breaths.
Chicago Marathon is in 2 days. I haven't run in about 2 months. I was doing well, got up to at least 10 or more miles...then Harry broke his leg, I got braces (they hurt!), started a new job, had IBS flares, had too much work training, have a 2 year old that I want to spend all of my free time with...But marathons are fun. I want to run! I want to finish. I want to know how to get to the finish line from the 13.1 mile marker!
I need to go pack. My flight leaves in 2 hours.