Per your description looks like it's a case of sciatica. Do a search in this site and you will find a bunch of us(including myself) suffered ffom it. It took me a little bit over a year and a half to get rid of the pain and back on the saddle. For excercise I did a lot of stretching and walking/hiking. Hang in there and be diligent in doing your rehab program and don't just sit down and think the pain will go away while doing so and you should be back on the saddle.