I have pain in my lower back which appears about 1-2 times a year and usually goes away in 1-2 weeks. The pain is not triggered by anything. When this happens I am unable to walk, unable to stand up by myself, unable to sleep, and I experience agonising muscle spasms. I have seen various doctors and received 3 different diagnoses: sciatica, slipped disc, facet joint syndrome. I have been refused a scan as I am 'too young'. I am 25 and otherwise healthy. I live in fear of this happening again.