Anyone resolved blood pooling?

This is my biggest problem. If I can fix this, I think that I would be in much better shape. I have Pectus Excavatum which can mimic POTS and I think I will have to do the NUSS procedure in the hopes it can better my symptoms. I use compression, drink fluid, salt and Mestinon. I also have kyphosis which my chiropractor tells me is severe though I dont think it looks severe..

I also most likely have MCAS which makes me want to try IVIG and potentially some kind of immunosupressive.

Im sorry...

Anyone resolved blood pooling?