NovusCorp, a leading healthcare provider, had meticulously designed its BC and DR plans, ensuring every potential risk was covered. Recently, its primary data center experienced a catastrophic flood. It swiftly activated its DR plan, transferring operations to its secondary data center. But within 24 hours, the provider faced an unforeseen challenge: the secondary data center began to receive a huge, unprecedented amount of data requests, causing system overloads and disruptions. This situation was not a part of the provider's initial risk assessment. In the face of this predicament, what should NovusCorp's immediate course of action be to ensure business continuity?