Questions about college [SAT, Sending scores etc.]?

It depends when the admission deadline is. If you're a senior and taking the SAT in January will get the results to them after the admission deadline, then they won't reconsider if they already rejected you by that point. Definitely retake it if the deadline is in February or later, because if you do better on it this time they will look at the highest scores. They will probably understand if your GPA sunk because of a medical reason, but I don't know much about those schools so I really can't say what your chances are of getting in.