Jul
mentally ill might only be mild depression through to schizophrenia whereas insane generally describes someone who has reached a point where they have lost control of reasonable behaviour and are usually a danger to themselves or somebody else , at this point they would nearly certainly be sectioned under mental health act.
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insane :
adj.
Of, exhibiting, or afflicted with insanity.
Characteristic of or associated with persons afflicted with insanity: an insane laugh; insane babbling.
Intended for use by such persons: an insane asylum.
Immoderate; wild: insane jealousy.
mental illness:
n.
Any of various conditions characterized by impairment of an individual's normal cognitive, emotional, or behavioral functioning, and caused by social, psychological, biochemical, genetic, or other factors, such as infection or head trauma. Also called emotional illness, mental disease; Also called mental disorder.
Very foolish; absurd: took insane risks behind the wheel.
[Latin īnsānus : in-, not; see in–1 sānus, sane, healthy.]
Personally, I think that mentally ill is the “politically correct” term for insanity
Mental Institutions used to be called Insane Asylums
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The legal definition of 'insane' isn’t knowing the difference between right and wrong. Psychosis is a good example. Having an anxiety disorder isn’t prone to result is a complete disconnect with reality. Even though, it'd be classed as a mental illness if severe enough, the person would probably never meet the criteria for legal insanity.
Answer:
No because it is a large belief that a pill can solve problems..
however therapy is another option..
there are other options as well but would be to graphic to describe.
The question is. can one know they’re truly mad? Yes…by definition it is repeating the same thing over and over..something we humans do very often.
We are symbols of machines as of late that’s the modern motto for life, love, prospertiy, and all there of.
You can state a person that’s mentally ill has a high likely hood of becoming superior or ill - thus if they turned ill leading to insanity.
Insanity usually is a climax - “past the point of no return”.
The mind goes into a catatonic like say you could state..in another literal sense any way in the fact that the person might state something over and over or have a thought in their mind and do something really harsh..like injured some one or another person whether that definition of sanity means spiritual or mental and physical all together as a conglomerate is something each individual has to decide for one self..
They state to survive one must be insane..another quote to know God is to know the face of madness..
of course my favourite..would have to be corinthians 13 and romans 3:4 
have a nice day O_O: yes I know i'm insane.
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I'm insane but not ill. Gawd, my counsellor person was so pleased this day when I rated my happiness between 1 and 2 outta 10 instead of 8 (0 is the best BTW).
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Basically the same.