Medication

Is it compulsory to follow the advice of a doctor?

Q: My question is regarding recent time of crisis when some of my fellow Muslims deny the lockdown and go to masjid. I try to convince them but need a proper basis. Somewhere I read, that it is mentioned in hadees, that If a person goes against the saying of doctor and eats prohibited things by doctor/expert which result to his death, it will be considered as suicide. Is it true? If yes, where is it mentioned.

Taking herbs as medication

Q: I would like to know if taking herbs for health reasons from a herbs doctor (boil herbs in water, drink remaining after straining ) is permissible. It sometimes includes animal bones (dried condition). Is it ok to drink it after boiling in water together with other herbs?