Very big spike in PSA number

I’m 69 years old and I’ve been getting my PSA blood test every 2-3 years for several years starting in my mid 50s. Numbers were at .50 for several years, then 8 years ago went to .6, then 6 years ago to .69, then 3 years ago to .93

Last week it jumped to 18. Obviously concerned but after calling urologists daily for the past week I STILL can’t get anything other than “we’re 4-6 weeks out for an appointment.” It’s getting very frustrating! Any suggestions other than camping out at the front door of urologist’s office?