@sophiak What program are you applying to?
As some people on here mentioned, I was rejected the first time I sent in my PhD applications, and I was absolutely crushed. I was accepted into a Master's program and I am reapplying for PhD this cycle.
Stress and anxiety are normal, but if you don't get in this round, you can either go into a Master's program or work in a related field, and then reapply as a stronger applicant. As someone with generalized anxiety disorder, I found comfort in meditation, talking to close friends, talking to my undergrad advisor, and yoga; maybe you could try one of those to ease the anxiety?
Your life isn't over if you get rejected; there are other ways to improve your application and be a re-admit. Don't give up! I know that at the moment it seems scary and daunting, but remember that there are people that care about you and will help you!