Thing about some docs is they are well 'known' for their 'attitudes' and can bad mouth patients so other docs won't want to treat them. SIGH!
Best words to use are: "WE AREN'T COMMUNICATING VERY WELL...AT ALL"
and just leave it at that with any new doc you see. No bad mouthing or the like...good docs KNOW what's really going on and will respect you for your tact.
AFTER you get established comfortably with a new doc, then seek out and complain with your insurance company. The state medical board might have a hard time 'proving' a case of malpractice without new stronger diagnostics [by new docs] to back things up. I know because I've looked into it.
Sounds like this guy is past his prime, and waaay outta date! Go forward and get the testing and treatments you need! Besides, word-of-mouth works many ways? Between docs and more importantly between patients!
Good fortune with new docs and many many

's - j