Hi dear. I do understand your concern. I will try to answer a part of it. Mental Illness are treatable means treatment is available for relieve of symptoms like in case of diabetes hypertension etc where the you have to take medicines regularly to control BP and Sugar.Its slightly different from "curable" which means complete cure. Now next part if by taking medication my quality of life improves one should take it. Side effects are there almost of everything in life. What is more important is risk vs benefits. I hope it helps.