Anyone with POTS here that found a way to kneel without fainting?

I have almost fainted twice now and I would like it to stop. Going to church is already a feat so I don't want to ruin it by needing to abort mission right before Communion, worrying the parish while I do breathing exercises in the coffee room trying to stave off the fainting and accompanying panic attack. I can't afford pressure stockings sadly, especially not since I'm wildly yoyoing in weight and would need multiple sizes.

Anyone managed to make the kneeling work? The standing is an issue too but at least then I can still pump my leg muscles to keep my blood from pooling and fainting. I haven't found any compensatory exercises that work for kneeling yet.