testing

Hello to all!!!! I have a question? Can anyone tell me about a disogram, have they ever had it? and if so is it as painful as Iam told by a few people upcoming test in about less then 2 weeks.getting a bit nerous. any help would be greatly appreciatedI have been thinking and not sure if I want to do this, But noone can seem to give me any more answers to why I suffer intenslty bad from back pain, what will this test show that a xray dont,mri"s.emg/nca,etc?? will it show where the pain is really coming from and what is causing it???? thank you all hope you have some what of a pain free day love and hugs Angel