I spent several months learning Alexander Technique after back surgery and found it very very helpful.
Basically it teaches you to hold your body in a way which puts least strain on your muscles. If you watch children play, they seem to have endless energy - partly because they are too young to have learned bad habits. AT will teach you what you want it to. Some people use it for general help, others for more specific problems. I learned how to walk again, and also how to sit and stand. Later, I went back to the same teacher to solve a problem with my hand when I was playing flute.
I would recommend you find a local teacher & have a chat with them. Tell them what your problems are and they should, if they are genuine, give you advice without asking for fat cheques. Be prepared for some work though - depending on what you need, it can take a while to learn.
Good luck!