Hi i am Dr Ahmed Aly thanks for using healthcaremagic site , I had gone through your question and understand your concerns .. Actually it may show this kind of muscular spasms if you have multiple spinal disc herniation in addition to abnormal calcium levels that may cause tetani in all your muscles all over your body and it is diagnosed by bilateral leg cramps or tremors if reached peak levels .for your low back pain i thinh that is a sort of sciatica both are of neurovascular origin of your spine . For my patient i suggest some lab investigations like calcium , magnesium and potassium levels to exclude hyper or hypocalcemia and Xrays , MRI , CT on spine to diagnose the site of vertebral herniation for proper management .. for now i consider NSAIDS painkillers like advil , hot massages with topical gels , muscle relaxants , B12 multivitamins , physiotherapy and even yoga are effective in such cases till the results of your tests are done . Please click THANK YOU and consider a 5 star rating with some positive feedback if the information was helpful. Hope the above information helps you, Any further clarifications feel free to ask.