Just for the record- my only real pain on my old bike was in my left elbow.
A lot of pain after 15 miles or more. We decided it was because it was a man's bike and the top tube was really too long for my proportions. Despite all kinds of fit tweaking which improved the general feel, we never could really get rid of that elbow pain. Plus I always felt like I was falling forward too much no matter what we did to correct it.
My new bike is a custom frame made to my measurements. It has a shorter reach and top tube, and has my weight balanced further back off my hands. It has exactly the same handlebars on it as the old bike. Elbow pain gone. Yay!

Hey congratulations on your big ride- excellent!!!