I think the OP was asking about herbal/non-prescription treatments for brain inflammation specifically BECAUSE we can't prove it to doctors. Like most things with this illness we have to take it into our own hands. PEA sounded like one of the most promising avenues and unlike many herbal choices, it doesn't have side effects like being diuretic or lowering blood pressure. That's the trouble with herbals, I find. I don't think there are any miraculous prescription anti-neuroinflammatories out there anyway, though I could be wrong on that. There isn't a lot a doctor could do even if he/she did believe you.
https://www.healthrising.org/blog/2...-fibromyalgia-chronic-fatigue-syndrome-mecfs/
This is another paper listing some natural anti-neuroinflammatories
https://www.frontiersin.org/articles/10.3389/fphar.2018.00548/full