I can't say I was a vegetarian, I just planned on going so. I think it was a bad thing to interrupt meat that fast
. I didn't eat any meat for about 8 months, and I interrupted it in just one day.
After three months I noticed by lower back was hurting me a bit. Anyhow, I think I suffered (and still am) from protein malnutrition or anemia.
I read on the Internet that malnutrition can cause lots of bad things, including back pain. It's the tissues and the muscles that develop problems because the lack of proteins.
I don't know what to think... anyhow, right now it's much better after about 10 days since I restarted to eat meat too. I would say it's about 70% better than before, so a lot of improvement. I hope it will get better in time.
How do you feel the pain in your lower-back? I didn't feel like it was coming from the spine. I felt it in my entire lower back and sometimes in the hips too. When I would walk for longer time (say 30-40 minutes), it got worse. I think there was some kind of inflammation because I was feeling much better when I was taking anti-inflammatory pills. So i guess there was some kind of inflammation, I don't know if this can be related or not.
Exercising would not help me at all, the pain was there all the time.