Did this start AFTER your bike fit? You said when you spin - do you mean spin class, or spinning on your bike? I'm still adjusting to my bike fit (mostly my new saddle, though lots of adjustments were made), and it's common to have some soreness after a fit while your body adjusts to the new position.
I try to set up the spin bike as close as possible to my bicycle geometry, especially since I spend more time in spin class than on my own steed - I also had the LBS set up my spin shoes to match my regular cycling shoes (spin class is in a gym and we need to wear non-marking white treaded shoes in there, so I have different shoes than I ride with).
Just a couple of ideas/questions.....