If you use the search function you will see a lot of great questions and answers from DTOCE on the subject of calcium scores etc. He is a great cardiologist and you will likely find many answers to any questions that are ticking over in the numerous threads on here.
I appreciate how anxiety provoking having a test come back like this can be. I often tell my patients that these sorts of processes are really like a journey and you are just at the beginning of this one at the moment and there are numerous things that will follow from here, but the end of that journey will hopefully have you in a better place than if you had not embarked on it at all.
In terms of the dizziness versus vertigo, it is too early to tell from the information you have provided whether this could be secondary to any cardiac issues and at the moment I would not give it much additional thought, the tests you will go through will provide more clarity on whether this may have been secondary to something cardiac related.
I hope all the tests etc go well from here.