Diagnosis of a mental illness would be an explanation, not explaining it away. You have used your brain to form the hypothesis that you are experiencing mind control by the government; but if that brain has a chemical imbalance (or some other difficulty), then all your thoughts are affected by it, including your self assessment. It's a bit like using a broken computer to diagnose itself - if the computer has a problem then you can't be sure that it's diagnosis is correct because the problem might prevent an accurate diagnosis.
How about this - you could have a chat with a doctor anyway, and maybe they can help you. If they can't, well, then you're no worse off than you were before.
While your description is clear and linear, it fails some critical practical point.
An explanation - which in this case would count as corroboration, not as causal link - requires trustworthiness instead of provisionality.
Similarly, you seem to come from Eutopia, where Professionals are easily available: people from Dartonmapia do not have that advantage, and all that seems available are «broken computer[s for] diagnos[tics]», with different degrees.
This, unfortunately, makes the hypothesis of remaining «no worse off» an "uninformed" idea.
I would rather encourage our friend to:
-- find some individual with strong background and intellectual abilities for consultancy (exchange, etc.), and
-- be prepared to face a long journey before achieving the identification of said valid Specialists.
Not me friend, the government is not “behind it” only instruments as ordinary men.
Your arm chair explanation is insightful, in its own way. How easily played off such things are by convention.
This phenomena has long since existed, and has only become more sophisticated in recent decades (you know how Americans are at pushing the envelope.)
Test this for yourself, can you sit quietly in a silent room and still your thoughts for fifteen minutes? If you are not alone in your own mind, you will soon distinguish your “noise” from those of an exogenous within you.
People who have chemical imbalances are more sensitive, and obviously crazy enough to talk about it.
We are not alone in our own minds.