You are correct that Spotsylvania County's Sheriff's Office will not disclose the particular charges for which warrants have issued. Nonetheless you increase your chances of being given a reasonable bond by turning yourself in sooner rather than later. An attorney can help you surrender and coordinate in advance with a bondsman to make the process as painless as possible, sometimes even avoiding a trip to the jail at all after the magistrate sets bond. You should also discuss your necessary travel with the attorney prior to surrender, so that the magistrate can be properly informed of your need to a.) remain out on bond and b.) travel to take care of your medical issues. While nothing is guaranteed, having this information organized puts you in the best position to remain free while the case is pending. You should act as soon as possible to get the warrant(s) served and start the ball rolling. You should not, under most circumstances, speak in substance about the allegations with anyone except an attorney - especially if the police or a prosecutor wants to talk to you.
Best of luck,
If there is an active warrant out for your arrest, no one is going to be able to excuse you from going to pick it up. You must formally be given the charges and bond out (if you can). Turning yourself in quickly is the best way to do so. If not, and they have to come get you, you can remain detained until they sort out what is needed from you.