For those with bad brain fog, what helped you?

I have embarrassing brain fog due to POTS and CFS caused by EDS. The onset of POTS and CFS was insidious which contributed to me having an extremely delayed diagnosis (12 years from onset). I'm on ivabradine for POTS and my heart rate is actually normal now, which I really appreciate, but the brain fog is still causing daily embarrassments and some days I can't even form a coherent sentence or process something directly in front of me. It's genuinely driving me nuts. Salt and fluids help a little but I'm still nowhere near my former self. Even my movement is slow like I'm underwater.