Mayo triages patients and if they think they can help and you need help sooner you might find you get in sooner, this could also be because certain departments have a longer wait time.Also if you are willing to go to a different location of Mayo, they might be able to get you in sooner.
Have you requested an appointment?

Hi James, if you’re interested in making an appointment at the Phoenix Mayo Clinic campus, here is a link to their website to get you started. Don’t let the possibility of a waiting list deter you. That may not be the case.
http://mayocl.in/1mtmR63
Since you’d be coming from the Philippine Islands, there is an international travel department which can help you with arrangements for travel and lodging.
https://www.mayoclinic.org/departments-centers/international
And one more valuable service is the Concierge department for all the little details to make your trip and stay easier.
https://www.mayoclinic.org/patient-visitor-guide/minnesota/concierge-services
I know this is a really stressful time with a lot of decisions to make. What do your kids think you should do? Would you be traveling alone?

@makatak47 Contact Mayo Clinic, and get their thoughts on wait time. Coming from the Philippines, there has to be a lead time to make arrangements, anyway.

Here is a link to the Mayo Clinic Care Network. It shows you a few different options within your landing area, that work with Mayo Clinic, including North Bay Healthcare near San Francisco [CA], Palomar Health near San Diego [CA], and Yuma Regional Medical Center [AZ]. I believe if you go to their websites you will gain a better understanding of their services offered, and contact information for getting an idea of lead times for your situation.
https://www.mayoclinic.org/about-mayo-clinic/care-network/network-members
To contact Mayo Clinic about an appointment [any campus] http://mayocl.in/1mtmR63
I hope this helps you out?
Ginger