As others have said, the waiting is the worst part. You'll feel better when you know the results, no matter what they are, because that takes away the uncertainty.
If I may inject a note of optimism, a PSA of 20 may very well indicate localised prostate cancer, but it's not a death sentence. It's a curable condition, and the overwhelming majority of men diagnosed with it go on to live normal lives after treatment. So if (as I strongly suspect it will) the result does come back positive, don't worry about it. It's a medical condition that can be and will be treated and then you can get on with your lives.
All the best,