My thoughts on the subject are: All the illnesses...mental and physical are terrible for the person suffering from the condition(s). There is no condition that is worse than another. To have an illness is awful period. Mental illness often causes the most fear because it is hard to see as compared to physical illnesses. However, mental illness can be treated much like physical illnesses with proper medication and therapy.

Thus the worst mental illness is to have one at all. That is what i think.