I currently sit on my bed, with legs crossed. this screws up my posture but I cant use a chair. I have no idea why, but if i use a chair for more than a couple days, my feet start to swell. after a week or less my shoes stop fitting and every step hurts. This process will continue to a lesser degree up my thighs. If I stop using a chair (and go back to sitting in bed) the swelling immediatly and rapidly starts to go down, clearing up fully after just a couple days.
That seems like it could be a really big problem, but i have no idea. I dont feel anything special except the pain from the swelling when i move.