First is to know stress is useful and normal to a point, in the back and forth of the mix of social creatures humans are. Its sometimes a sidespin from ambition and over-reaching oneself, a sort of 'alarm bell"
However continued "stress" and the arrival of much more serious 'anxiety" can trigger depression and post traumatic stress disorder. (PTSD) Panic attacks and sleep disorder usually follow and capacity to function becomes impaired to the point of disability. These in turn have already been shown to have a part correlation with later earlier onset dementia in a study on war veterans. Expected lifespan can be reduced by continuous exposure.
So the trick is to get out of the way of stress situations, even if you have to take financial losses and let go of some ambitions for the meantime.
If the source is a person, just get away from them, the world is not yet capable of protecting individuals who are bullied and ruined by others.
I used to have stress I just don't care about it anymore stress is caused by getting into other pols problems or doing bad in school or something if its school or something strive to do better if relationships or something just ignore it and do something fun