Welcome Tolkny!
You say you're physically unfit & unable to deal with practicalities. If these two are related, then when I was over 160kgs (360 lbs for the heathens) I couldn't walk for more than a minute without severe back pain. Turns out my gait was completely screwed, fixing it took two months and then I was off to the races. Took a while to figure out though. Trust me, its worth it keeping trying. Everyone's solution is different but when you find it, it is heaven.
Best of luck!
KP