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It’s interesting that a low dose of Benadryl helped with your cognitive symptoms. Using antihistamines to target mitochondrial swelling is a theory I haven't seen much of on here. Definitely something to discuss with a doctor before adding it to a regular regimen.

The link between EBV and MS has been getting a lot more attention in research lately. It’s interesting that you found relief with antivirals, but people definitely need to be careful about off-label dosages without medical supervision.

That sounds incredibly exhausting to deal with every day. The balance issues and "spatial awareness" stuff really suggest you need a full neurological workup as soon as possible. Don't wait on this.