I just really wonder especially with it being triggered by the weather. Here's an excerpt from the above link.Sphenoid Sinusitis: Less Common, but Still a Painful Condition
During a bout with sinusitis, it is typical to have pressure, pain and infection in one of the four pairs of sinuses. The four main pair of sinuses are the maxillary, the frontal, the enthmoid, and the sphenoid sinuses. While sphenoid sinusitis is a less common form of sinusitis, it is still just as painful and worthy of further examination.