Looking for a pain med that will take care of severe back pain but not have me turn into a zombie. was prescribed opana 20 mgs and they made me feel "high as heck" for lack of a better description..but they do ease the pain. will this medicine make the pain go away as well as the opana without the strong "high"? If not, how bad are the side effects... will I be able to go to work without being in la la land and be able to drive my car etc...