I'm so tired of feeling sick and tired

My body is just a mess, and not just because of the dysphoria.
I slipped a disk when I was pregnant and I've only just started getting physio sessions to fix it all up. So for a year and a half I've been in pain, unable to sleep properly, unable to really move around much causing weight gain and loss of muscle.
I really just want to be back to normal, my physiotherapist told me not to do any exercise especially weight training of any kind until I fix all my back muscles and make my spine strong enough to hold everything properly and it's SO frustrating.
I hate being so useless, and in pain all the time. I was given some strong pain killers which help the pain but they make me horribly drowsy.
Just aaaargh why can't my body just give it a rest D= surely it causes me enough agro without physically breaking down. *shakes fist at universe*