Rita,
These are difficult situations because it is not known (or at least from what I can see) is the cause of the autoimmune encephalitis. Here are a few things you need:
-What is the clinical history
-What is know to have triggered the problem or at least suspected?
-What tests (labs, scans) have been done to diagnosis the condition?
In general, anti-inflammatory interventions can help like NeuroProtek and Ibuprofen, but these are just band-aides when the actual cause is not known.
Hyperbaric oxygen therapy (HBOT) can be helpful overall.
Low Dose Naltrexone (LDN) is one inexpensive intervention (needs to be obtained from a compounding pharmacy) that can be helpful directly for autoimmunity in general – https://lowdosenaltrexone.org.
Dr. Woeller
BTW – the Furan 2,5 dicarboxylic is linked to Aspergillus mold exposure. I would minimally perform a GPL-MycoTOX Profile.