I had my third surgery L4/L5 fusion in Jan and have been in a lot of pain the last two weeks. Had another MRI and both my neurosurgeon and my PCP told me I had enhancing scar tissue with inflamation causing the nerves to be compressed. This is causing all the pain which has lasted two weeks. Both DR's called it a "Flare up". How long do your flare up's last? I am on oxycode 15mg and a strong anti-inflamitory meds to get it under control. Any other pointers that may help?