Welcome! My name isXXXXX am a 2003 graduate, and currently a Medical Director of a veterinary hospital.
Sorry to hear about this concern.
Insulin is very sensitive to these types of changes. Even if you shake the bottle too hard, it can cause problems for the insulin molecules.
I do vote for getting a new bottle. In the absence of nothing available yet, I would use it, because to not give any could result in problems as well, but definitely, try to get a new bottle today.
If it were just a few hours, that would be one thing, but 12-14 on a bottle that has been in previous use is quite awhile. Sorry for the inconvenience.
May I be of any further assistance?
No. I suspected that I would need a new vial. Thank you for your assistance.