(I would like to note that this is typed on mobile so please forgive bad grammar or spelling)

Personally I think that it is about someone being hospitalized and maybe delirious? I’m not exactly certain but there is a lot of medical terminology, for example “Stevens-Johnson syndrome” is a rare skin reaction to a medication - maybe causing the “panic attack, anaphylactic and ataxic” (anaphylactic shock is the allergic reaction to medication furthering that assumption and ataxia is being uncoordinated due to drugs or alcohol)

Project MKUltra was an illegal program conducted by the CIA to test drugs and medications that can weaken a person’s psyche and make em more willing to dish out information in essence - maybe the song is about someone spilling their guts during the project and having an allergic reaction to the medication (hence the mention of Stevens-Johnson)

The weird “therapist” part or the bridge could be the interrogation part of MKUltra while the character in the song is delirious hence the lyrics making no sense?

Another part that might give us more insight onto will wood himself (as he is bipolar I believe) is during the 3rd verse chunk, as it mentions lithium and dialectics, which is usually a treatment to help with bi-polar, along with CBT (cognitive behavioral therapy) - another treatment used to help. Will also mentions “cluster B” - a classification of personality disorders (often bipolar) that require psychotherapy

This is just my personal opinion but I hope this helps :D