A herniated disc is what we used to call a 'slipped disc' years ago. Technically speaking, discs can't 'slip' out of place as such. What's happened is that the disc has developed a bulge which usually impringes on the sciatic nerve with the consequential 'referred pain,' as they call it. This is pain that manifests itself down the back of the leg but actually originates at the sight of the nerve impringement. Usually with rest, physiotherapy and moderate mobility the pain subsides. Core abdominal strength is part of the key to preventing reoccurrence, but you should stop running altogether with any symptoms before you embark on any rehabilitation program. You must talk to a qualified physio about this, I can only tell you of my own personal experience. A word of caution from someone who's been there: if you develop any numbness or loss of muscle function seek medical advice straight away as in the worst case scenario the disc can prolapse , which means that it ruptures and the soft core bulges out damaging the sciatic nerve. This happened to me in 1990 and I ended up in surgery. The good news is that the surgery is usually very successful and fortunately I am still running today but it takes quite a long recovery. You have my sympathies, I know how hard and frustrating it is, but be smart and patient, I bless every day that I'm out there running the roads and fields all these years later.
