Gosh,
@sjm 1308 - That's a tough run of luck! Are your feet OK, in terms of full sensation or do you have any numb patches?
I'm certainly not making any judgements on you or the falls you've had, but have you had your bone density checked, to ensure they're as strong as you can manage? Osteopenia leading onto osteoporosis is a sneaky condition that can creep up on a person.
Due to some medication I have just started (nothing to do with diabetes), I had a DXA, bone density, scan on Tuesday. All-in, it took about 15 minutes to check in, have my height/weight measured and the scan. I'll get the results in due course.
It could be worth checking, and the scans don't cost much at all.
As for your question on boots, I have some fabulously comfy Rohde and some Ecco boots, which have good soles on them.