Not sure what a "white blood cell count of 22" means but it is probably short-hand for a count of 22,000. Equally as important as the number of cells, is the type of cell that is either increased or decreased. That information can provide clues as to what is going on.
What you describe is consistent with the diagnosis of Mononucleosis but also with the diagnosis of infectious disease such as bacterial pharyngitis or Toxoplasmosis, a parasitic disease. It is also consistent with the diagnosis of Hodgkin's disease or what is called non-Hodgkin's Lymphoma.
The rationale for waiting a month is not clear. Rather than waiting a month, you should have a chest x-ray and, if the neck lymph nodes have been enlarged for more than 4 weeks, a lymph node biopsy.