a) Well founded things are roughly the things your doctor recommends. The rest is unfounded. Some unfounded things might really be worth trying if you have time and strength. Most aren't. Yet people who know you that mean well but have very limited capacity to evaluate what is worthwhile and what is not will firmly believe that the idea they are bringing you is the one that will cure your illness and the only hurdle is convincing you to apply it. That's what gets tiring.

b) In most cases there are just a few things or no things that actually might work. But there's thousands of ideas floating around of what people say might help. Ranging from "you must eat a spoonful of this spice daily" to "there's this small lab on the other site of the planet that make this expensive substance that will cure you but what they do isn't technically legal and might kill you".