Short answer:
Go to a PT who specializes in athletes and cyclists. They will understand all the dynamics of athletics, body mechanics and cycling. And, if you are feeling discomfort or pain, often you can get a prescription and insurance will pay for it.
My recommendations are:
Coropre Sano Physical Therapy in Kenmore
Experience Momentum Physical Therapy in Lynnwood (Ask for Blake)
TL;DR:
Bike fitting is like this: A casual rider doesn't' need it. A long-distance rider and one doing lots of annual miles needs an expert fitter. Ther is no in between. Bike shop fitters are the in between.
I am very skeptical of bike fitting at bike shops. Most typically bike shop fitters are shop guys who have been told some stuff by other shop guys. Sometime shopfitters have been to a seminar. Rarely shop fitters know kinesiology, physiology or other body mechanics theories that will help them evaluate the rider's particular problems. Shopfitters work within a set of guidelines that are based on averages and on doing it the way we did it before. Then their fitting is affected by their bias - like a young crit racer might think everyone needs to be as aero as possible and everyone will always ride in the drops.
And bike fitting is not static. Numb hands might be due to core strength problems. Knee pain might be due to week hip muscles. A PT might suggest one riding positions, + some exercises, then a change in the riding position as fitness improves.
Or there might be an adequate fit, but the rider might have issues with discomfort because of some bad habits, like hunching shoulders, or bad riding mechanics, like riding with pointed toes, or riding at 60RPM. A PT can catch this, and suggest a biomechanical fix, whereas a shop fitter will not be able to do this.