That's great that you were able to figure all that out on your own. Not every does, and they work themselves into uncomfortable positions and don't know why or what to adjust to fix it, or sometimes make it worse. If it were that easy, there wouldn't be so many "check my fit" or "fit advice" threads on BF.

If you are comfortable on the bike, have no pain, numbness or other "issues", and are happy with your performance, then there isn't much reason to pay someone for a fit. If there is some area you think could be improved, then a fit may be worth it to eek out some more comfort or performance. You can go beyond "the guy at the shop" and look into some of the dynamic fitting systems like Retul, etc.

So it's likely not as bad as it sounded earlier, but obviously not everything is fine if you aren't happy with some aspect of your fit. Of course once you get out and ride, you will feel differently than sitting on a trainer. Additionally, as others have said, your fitness may have improved, etc. Go back to the guy, talk to him about what you don't feel is right, and ask about different stem lengths. Since you bought it from him and he fit you on it in the first place, a "re-fit" should include re-evaluating any stem choices and swapping as necessary to get it correct.