Do you have any kind of a diagnosis?
Have you seen a doctor, or an expert chiropractor, for these symptoms yet?
I am about the same -40 lbs overweight- but I don't have any pain that makes me have to lie down.
I do have RSI/TOS that affects my arms, hands and upper body.

Have you read about chronic fatigue, fybromyalgia?
You could also have something totally different that might show up with tests - like xray or MRI, blood work, and a detailed exam.