Hibee
I hope you find a nice home for yourself and a job too! You always seem like such a modest kind patient man. (Are you really like that in real life? lol). You deserve to be happy.
As for your back, I am sorry it's been so tough for you. Yes, sitting a long time is a bad idea. Exercise when you can. There are various ways to exercise without affecting your back.
Also, have you used body pillows?
like this?
It's suppose to help with back pain.
Take good care of yourself.