Move to Massachusetts. I'm serious. MA has a regulated health insurance exchange. You can compare plans on the exchange website; plans as well as premium increases have to be approved by the exchange administrator. So if an insurance company decides to raise premiums by 80%, they'll be kicked off the exchange. Plus, in MA it is illegal to refuse coverage for pre-existing conditions. They can't even vary the price based on factors other than age/gender/location and maybe smoking. Check out https://www.mahealthconnector.org/portal/site/connector/menu... to see for yourself.
On the down side, you have to have insurance or pay a big fine every year. And healthcare, just like everything else in MA is expensive. But probably cheaper than CA.