I think to some point, these diseases can become harmful...
But for most people, they believe that they have all these diseases at once and they're very very sick! ...sadly, for most people, they just BELIEVE they have the disease, when they just have a small habit or just a random body action... in other words: They don't have the disease, they just think they do.
As for drugs? No, that's when it gets too serious.
In most of those cases, a good amount of rest or a small amount of excercise could rid of these "diseases" almost immediately.
...as for personality "diseases", well, that can mostly disappear with age. If it doesn't, well, that'd still be up to you on how to cure it.
...besides, drugs aren't the only answer..... anything from physical treatments (certain excercises, massages) to herbal treatments or just changing diets or etc...
.........drugs don't heal everything, in fact, most times it either makes it worse or gives more problems. ...but to each their own, everyone has a different chemical balance.