With out a little more information, I'm not sure I can provide a meaningful answer. In response to comments, I thought I would make it clear that both products are likely the same (double distilled witch hazel). You should continue using the new bottle as before, assuming you were properly using it in the first place.
I doubt there are any truly 100% witch hazel products, other than the plant itself, that are commercially available. The "100%" product is normally labeled as "essential oil." This would be opposed to the "extract" which has a higher concentration of solvent (in this case ethanol), which can be removed in sequential distillation steps.
Double distilled extract is what is most commonly used medically, and it has 14% ethanol by volume as you described. Any medical recommendations you received would almost assuredly be about this concentration. Did it perhaps say it was 100% Witch Hazel in a 14% ethanol solution? While not clear, that would be accurate.
Browsing my institution's ordering system, the highest concentration I could find was from a chemical supply company, and that was with 8% ethanol. I don't think this would provide you any advantage, and you should probably just by a reasonably priced generic from your local retailer.