i'm not sure this will help, but i'm trying
I am sorry to hear about the way you feel and understand how frustrating it is.
I am studying Phisyotherapy now and it seems like you are suffering from something.
You didn't mention, but have you been diagnosed? I am not in any way a doctor, but since my field works a lot with people with pains of all sorts (amongst other things) I hear of many different diseases that can cause what you mentioned.
I really don't want to make you feel bad or panic but if you really have something, there might be a known treatment for it.
There are many things like Rheumatoid Arthritis, Osteo-Arthritis Fibro-Myalgia etc, all causeing pains in the joints and things you mentioned.
Please don't let these things I wrote bring you down, but if you have a diagnosis maybe there is some treatment you can get. In any case, I believe phisyotherapy or hydrotherapy can help you, but I don't know your history etc.
I hope you feel better and find answers to your questions.