myoclonus

The first with rapid-onset serotonin syndrome and the latter with (also temporary) ticks, myoclonus, and vestibular problems.

And the 12th one I tried gave me terrible vertical and horizontal nystagmus and whole-body, sporadic myoclonus.

Not to comment on the rest, but to perhaps ameliorate your tremor and myoclonus have you tried supplements of essential fatty acids (omega 3)?

That shit gave me seizures, zaps, and myoclonus.

Seizure is pretty rare - it produces stuff that looks like seizure (myoclonus, tremor, delirium), but actual seizure is only seen in SS so severe that it’s usually fatal.

Meanwhile myoclonus, nystagmus, anhedonia, (autoimmune?) inflammation/swelling, tremors keep getting worse.

The Orphan Drug Act of 1983 is a law passed in the United States to facilitate the development of orphan drugs—drugs for rare diseases such as Huntington's disease, myoclonus, ALS, Tourette syndrome and muscular dystrophy which affect small numbers of individuals residing in the United States.

Several case reports of patients with PD, multiple sclerosis, myoclonus dystonia, Alzheimer's disease, chronic fatigue syndrome, and autism have shown that FMT and/or antibiotic regimen was helpful in treating GIT symptoms like constipation, ulcerative colitis, and bowel disorders.

My best guess is it is a form of epilepsy commonly called "negative myoclonus".

That's a bit of a link-bait title, the first line of the abstract reads: "This case report describes a patient who had hypoxia and posthypoxic intention myoclonus and subsequently developed clonic seizures while solving sudoku puzzles." So the patient already had some brain damage and the puzzles were a trigger (there are many known potential triggers for seizures including stress).