Tall and need furniture help

I am around 190cm, and virtually all furniture I can find is too short for me. Whenever I sit down, if I keep my feet flat on the ground, my knees always end up above my waist. This rounds my lower back, and causes back pain.

After being in Japan a while, it is really starting to have some adverse effects on my quality of life.

Can anyone recommend me a bed, computer chair, and sofa that won't cause long term damage to my spine? I feel like I am doing a squat every-time I stand up.

I'm not rich but I can pull out the middle class wallet for my own health here.

by ExPatriot0