I have to disagree with camapg. A good fitting can cost a few to several hundred dollars .... and is really best for people looking to get a little more out of their bodies, not for a basic, "Is this bike the right size" sort of issues.

No reason not to go to a fitter if you really want o ...and can afford it ... but do a Lot of research to make sure you are getting a good one, and one who will listen and set you up as You want to be set up, and who will work with you if you ride more and your "optimal" position changes.

or .... you could do the same amount of online research about bike fit, and get a decent understanding yourself of what your options are, what different ideas are out there about fitting, and how they might apply to you and your body and your riding style.

You already have a drop-bar road bike. Are you comfortable riding it for an hour or more? if I were you, I might get my saddle/bottom bracket relationship dialed in---how far from the center of the bottom bracket (where the pedals connect) to where the saddle clamps to the seat tube) when the saddle is at the right height. I would also play with moving the saddle a little forward or back if it wasn't comfortable.

Then I would see how I sat on the bike----was I reaching too fr forward and carrying too much weight on my hands? Was I sitting more upright that i preferred? i would grab the handlebars at different places to try different body positions, to see what felt best.

Then I would measure the top tube, and find the length and angle of my stem, and reach of my handlebars. I would look at how far below my saddle, my bars were.

if the bike fit as it was, i would look for the same measurements on the new bike. if it was a little too long or tall or short, i would look for better numbers.