I've just joined PR and found this thread, with the familiar mix of joy and regret at finding someone else with a symptom I have, especially when a broken ankle was the result. I hope you are well on the way to recovery now.
I've had CFS/ME/whatever for 20 years and my left leg has always been the weaker, it would always start to drag as I tired; but about two years ago it got worse, and later my left hand joined in for good measure. I too have had a couple of incidents when my left leg simply gave way: it felt as though the femur had failed to connect at the knee. I walk with a slight limp even on "good" days, usually experiencing shooting pains up from my foot and in my knee at each step, like the Little Mermaid. Standing up can be a challenge, and I often need a helping hand until my legs "learn" to take my weight again; again, the left leg is always the weaker. My left hand is permanently weaker now too, moves more slowly and with less precision, making writing and needlework more challenging, and on a few occasions has refused to move at all.
And the main problem, the thing I'd really like feedback on, has been that my left foot too often fails to obey instructions, especially when I'm making a turn, which of course makes things worse, as vectors are involved. I've had several falls, none of them serious, fortunately, though I did have a pretty bad tumble when doing a treadmill test recently for a cardiologistor rather not doing it, as my left foot did not move when the treadmill did, down I went, and that was the end of that.
I have dysautonomia, with depressed sympathetic and especially parasympathetic systems, and in the past have had abnormal EEGs and an abnormal QEEG, showing most brain activity in the delta region. But a recent LP, two MRIs, an electrical potentials test, and various other tests, were all normal, with no sign of inflammation, myelin loss, or anything relevant, and the neurologist I'm seeing, an ataxia specialist, is baffled; I'm now awaiting the results of a PET scan and a meeting with a movement problems specialist. Another odd thing is that my toes have started to turn in (to the right) and downwards on my left foot; it's not a problem yet, but I'm thinking of getting one of those gizmos that hold your toes straight.
I'd begun to think that these symptoms are unconnected with my CFS; now I'm not so sure!