Ok. As some of you may be aware

I have been omg sooooo poorly for nearly a month after severe back pain put me on morphine. I have spent much of that time lying down, although every day, even on the worst days, I have got up as often as I can and had a little walk about.
I went through morphine hell in all sorts of ways

much of it because of yet more GP failings, and then came out through Morphine Hell part II - The Withdrawal. I had the shakes, body temperature all over the place, I was very sick, couldn't keep anything down, had monstrous diahorrea, etc. The whole bag of tricks. I don't remember a lot of the last few weeks.
I'm finally feeling a bit more like myself, but I'm very weak. I went downstairs this morning, out of sheer defiance (hadn't been downstairs for weeks), and had to really hang on to everything. When I went to go back upstairs, I did my usual, and put my CRPS leg up first. Nothing. Nada. Squat. No response from my leg at all, it was so weird. I went slowly back up, leading with my 'good' leg, and am now predictably exhausted. It's scary how weak I feel.
I have a scan on Tueeday to check my lumbar spine for anything - the doc I saw thought I had slipped a disc - but my back, apart from feeling a bit unstable, isn't actually doing too badly. I'm trying to stay straight and not sit crookedly, etc.
I'm really looking for some good advice about starting gentle stretching and exercise to start recuperating from this time, and building back some of the strength I've lost. Before this time, I was doing ok, but not doing much by way of cardio. On reflection I didn't have good core strength, although I had good ROM. My CRPS is all in my left side, particularly my leg and both feet. I have PFOA in both knees.
I'm watching my diet and eating healthily, and I'm going to start taking some vitamin D for my immune system. It's sunny today, and my target is to get out into it, even if it's just onto the front step lol.
Ay ideas really really welcome

and thank you in advance!!
Bram.