Sleepless night before flight

Hey all 30m here, haven’t flown in about 3 years and I have had a debilitating fear of heights, dying and flying for a long time now. I take my first flight soon and my dr gave me some lorazepam to help but right now I’m feeling like the “chill pill” will actually be over ridden by my sheer anxiety and dread. Just wanted to talk and share my thoughts at the moment.