Speed comes from what you put behind you. - Judi Ketteler
A professional fitting is good because someone will be able to tell if perhaps the bars are the wrong size or maybe your stem is just too long/short or the wrong angle. Regardless, give yourself time to get used to the new position. If you ride with someone else, ask them to watch your neck and shoulders. Are they tensing up when you ride? Good luck!
Girl meets bike. Bike leads girl to a life of grime: http://mudandmanoloscycling.com/