You're probably going to get a lot of personal stories in response so I'll go ahead with mine. Same as yours and I was told (by a chiro and with no scans, etc.) that I had all the symptoms of a bulging disk. Whatever it was, it felt awful. I took some time off, did some high rep rack pulls, and started doing a lot of stretching, etc. It may be that you just need to let your back rest a little while before trying the high-rep work. It's been my goal to create a stable c@re after that little incident. No trouble since.