I have severe pain in my spine and lower back,goes to my tailbone and then radiates down my right leg,often causing it to go numb. The doctor I went to,refused to do an mri,and said he didn’t see anything on the xray. I am only 34 and I know this is not normal,I have lost an extreme amount of weight,due to the pain making me sick to the point I vomit.could you please give me some kind of idea as to what this could be.