i had a similar problem and was a candidate for spinal fusion. saw a neurologist. the surgery changed my life for the absolute better. i too used memory foam for years but still was miserable with pain. later numbness, cause spinal fluid was being pinched off. encourage you to consider this avenue. if you have a good surgeon...too many ppl don't research a good doctor and end up scaring everybody...you will be the new and improved you. very limited recovery time...about 6 weeks i couldn't drive but was mobile after about 2 weeks, just careful. vocational rehabilitation would fund your operation. see other place you posted for my post re this. if u have questions feel free to pm me.