Fitting is very subjective and also philosophical. Kind of like a therapist or massage therapist: you may have to find one you trust and that may take some time.

And, if you are making changes after having spent a lot of time in a certain position, you should make very small, incremental changes to "test" things out. Very small, like 5mm if it is a saddle fore/aft or height change, no more than 1cm with the stem, etc. Your new position may be a good one, but may be asking too much of your body if it is very accustomed to a different one.

If you paid good bucks and think your fitter knows what s/he is doing, you may want to continue with the same fitter and see if they can modify their suggestion to help you, or see it a different way. Like I said, fit can be subjective and it can also be a process. There are many schools and techniques that often create different end result, and sometimes one session isn't adequate to fix the issue.