You can learn happiness by indeed ignoring most of the real world. Thing is, much of the real world you read and hear is not real; first start ignoring all news and online blabber. Ignore anything that you don’t see happening yourself. Then move to a country with a social safety net and a soft stance on crime so if something happens you are less likely to get unrepairable unhappy. Then move to the countryside where nothing happens.
Never care about ‘stuff’ or having stuff. I have a phone and nreal glasses and a keyboard with trackpad. Further I have a passport and creditcard. That’s the stuff I mildly care about but it is replaceable within 1 day so not really. I buy clothes secondhand and don’t care about them at all, so losing a suitcase when travelling is incredibly uninteresting. I have seen people cry on airports for losing (well, probably delayed receiving of) their clothes: how sad can you make your life?
What also helps, and which is the opposite of thinking there is a deity watching over you (which to me is borderline insanity really), is accepting the universe doesn’t care about you or anything, so you should neither. Shit happens, there is no reason for anything and then you die. So just do whatever you want to do and stop caring what anyone thinks or does or says. You don’t ‘need’ to do anything; the universe is large and cold and you owe it nothing. Nothing cares if you make a spaceship to Mars or sit home drinking beer and playing games. It’s the same thing. Pick the one that makes you happy, not the one you get forced on you by society. Humanity might care (often seems they don’t), but humanity is a minuscule blib in time/space and the universe still doesn’t care anyway.
I fixed my miserable life I thought I had before with this and I am known by everyone as that weird guy that always smiles.
I'm also not sure why you single out doctors who believe?
It's even more naive to follow arbitrary rules in hope those rules came from some god and hoping that your way in believing is the right way.
If there is ever a god I will either go to 'heaven' (why would I want that though?!) or that god can fuck itself.
I'm good to others I don't need to pray. And funny enough I bet there are plenty of god worshippers who had kids who died and no prayer made a difference while in parallel there are other people who believe their prayers were heard and got a good grade at school or whatever.
But sustainable? It is a boost. In the end physical and mental things will break and you will need things that will make you unhappy. Morphine drip seems an option and likely many people will experience that when eol now.
