Well, I went to the orthopedic doctor for my lower back pain and he determined that my SI joint was irritated. Fortunately there is no bone/disc/nerve damage. I have been told to stay off the bike "for a little while, just while your PT gets going". I'm sure it's hard to say how long it will take for PT to get this thing back in shape. One thing I do know is that continual riding irritates it.
Has anyone else had experience with SI joint problems? How long did it take to get over it with PT or time off the bike?
Given that my base training just started, I suppose it's not the worst time to take off, but it means I'll postpone the start of my training and thus my peak later next year... This stinks.