I read your message ...and it can mean a number of things.....I was diagnosed with stage 3 b renal cancer........as I am just about a vegetarian.....I was having numbness,muscle spasms, etc...and the Dr. said I was anemic....so had to take iron pills....then found out later that my vitamin B12 was low......and they put me on B12 pills....now I have to go back to get blood tests to find out if I am absorbing the 12 pills ....ourwise ....I might end up getting B12 shots...also I would like to say .....is that...i had so much fatigue with the cancer.....that I would eat what would take the least amount of cooking....so that is part of the reason I ended up this way.... cause it was easier eating fresh fruits and veggies ...cause all you had to do was wash them ....then eat them raw....
another thing you could try ...is elevate your legs/feet on top a stool,etc....when you are sitting or lying down.....I sleep/rest....with a pillow underneath my knees and that seems to take a bit of the pressure off of the lower back...another thing....if you lay on your side....try putting a pillow between the legs or knees....that helps too.
There can be so many reasons for back pain...like a kidney infection,sciatica,muscle spasms,arthritis.or your might have more problems from the cancer,etc....just to name a few ....but then i also suffer from chronic pain....and they put me on morphine cause all the other pain meds....had more toxic side effects when you have been on them for long term....morphine has been around for a very long time....anti-inflammatories ...have bad stomach,liver,kidney side effects....asprin....causes stomach bleeding,ulcers,etc...and tylenol is toxic to the liver.....so in the long run ...the morphine....gave me better pain control and I was to reduce some of my meds....one good thing about morphine is that it does not have the toxic effects on the organs like those other meds do....but you have to use morphine the way it has to be used for pain therapy....because it gets a really bad rap because it is addictive.....but if you use it properly .....you do not get addicted to it at all...it gives me a better quality of life....after all what good am I to my family if I am curled up in ball in intense pain....and cant do anything....is it fair and good if my family sees me like that all the time....no.....it was a tough decision at the time to go on the morphine.....and I realize now that in hindsight that I put my body through a lot of suffering.... all because i did not want to go on it ....one thing you have to remember...when you do not get good pain therapy...and .if you get an added injury/illness on top of it ....its take your body longer to recover with that extra added stress put upon it.....so that is another issue to think about....do not know if this helps you or not....but I wish you the best and hope that you find out what is causing this and get the proper treatment for it.