Not sure if the link will work, but this is my thread of multiple trips, each with its own set of triggers, and what I did to overcome them.
It’s hard in the beginning, but it gets easier. And since you’re running, focus on that end goal. NO ONE ever ran their best marathon while drinking beforehand. It dehydrates you, makes you tired, and can aggravate stomach problems in the race. Mind you, I’ve been running since I was a teen and ran endless races while I still drank. My best half marathon time - even with little training and a gap of 15 years since my last - was when I was 10 days sober. I was 15 years OLDER, 6 weeks of training and ran faster than I had all my life, with energy to spare.
You can do this and you’ll be so thrilled you did it 
Make a plan, find interesting things to occupy your time, enjoy non-alcoholic beverages that taste awesome - coffee, tea, juices, milkshakes… 