Its amazing how little changes when they are implemented can make a great deal of difference. My injury was such that I lost over 50% of my neck movement. I now have 90% of it back - though I do have some "off" days (i.e. I haven't managed the triggers properly) most of the time if I stick to all the little changes then it is much better, though I did have 18 months of physio and that certainly helped.
Losing the bad habits is the hardest thing to do. Again, it boils down to discipline and finding the energy to make the changes and stick to them.
Posture is so important in helping to relieve stress, but equally those steps you have mentioned can help prevent the physical attributes of stress appearing.
Caring has got to be one of the most physically, emotionally and time demanding roles around. I see how stressed my Mum gets with Dad. I will try and share this with her when I speak to her next. Of course when you get so stressed even advice can seem like a further stress!
Its all very interesting stuff - especially when we get it to work!
Thanks
Alison