It’s so rare, there are no specialists on it in the UK. All they can suggest is a high protein diet with high doses of vitamin B3, to try to remediate the deficiencies, it causes. The triggers for it, are the same as her epilepsy - physical stress on the body such as hunger, pain, heat, cold, etc; or emotional stress. In her case, we think the obvious symptoms are the neuropsychiatric ones - depression, anxiety, emotional volatility, ADHD…
She’s very sensitive to the psychiatric adverse effects of the AEDs and has to be on the lowest therapeutic doses of all of them. I now think it’s connected to the metabolic disorder somehow.
Her epilepsy just got worse and worse for years, until they tried sodium valproate, clobazam, Rufinamide, cenobamate (which does nothing for seizure control, but improves her mood) and Depo Provera injections every 9 weeks.