I definitely get the fear quotient. My cycle will begin on Sept. 21st. I make sure that I have my gear all lined up and ready to go. Plenty of O2 on hand!
Also, I stay on the D3 Regimen. Are you doing that? It really does help many of us!! I up my D intake to 15,000 as opposed to the normal 10,000/day.
In addition, I make sure that I follow a set sleep schedule. Get up the same time daily, no matter what.
The better armed that I am, the less stress I have. If you bust, then do that in advance. Put that info on a closed board - Members Only - and you will get a lot of replies from those who rely on that.
Then, just breath deep, decide you have done all that you can and move on with life.
Good Luck!