My LBS guy (where I bought the bike from) is really nice, but I'm not sure how experienced he is at fitting. I was having some numbness in my left hand, so I took it back up there and he moved the handlebars down and moved the seat back a bit to take some pressure off my hands, thus resulting in the neck and lower back pain. He told me I can take it back up there any time and put it on the trainer, so I might take him up on that.
Another issue might be that I usually don't stretch before I go out. I used to kayak and learned the hard way (i.e. throwing out my back) about not stretching. So, I know I need to do that regularly as well.