Had this experience too, not to this extent.
Literally said I needed a bunch of procedures. I got the list, went to another dentist, who gave me a whole separate list of things. Few of the things lined up. And was already paying $200-400 just for the initial exam.
Feeling confused and frustrated that I already spent $500 and not get any help, I ignored it for a few more years and then went to a third dentist, who was focused more on preventive care, took care of me.
Dentists who don't want to see you more than once a year are the good ones. The red flags are ones who suggest payment plans during your procedure.