Hi! Any insight to these medications from someone whom has actually taken for constant pain appreciated. I have basically drastically cut of all beneficially pain medications since my back & neck pain began/continued. My Dr gave me an assisnment since I have no insurance to find the most affordable ways to get 1 of these meds & decide which I wanted to start with: Exalgo 8mg, Butran 5 &/or 7.5mcg or Nucyata 50mcg. I've never tried these meds & unsure which to start on, I know I can't continue to function with the pain level I currently try to tolerate. Please Help... Thanks!