A recurrence can occurr anytime, can even be synchronous or metachrounous cancer too, but the average recurrence for oropharyngeal cancer is around 7.8 months, and is rare that it occurs so soon after treatment, but can, and that may influence outcome. Only a biopsy can prove it's cancer or not, and doesn't sound like it was done being you mention, "I may have developed..."
Immunotherapy, which also covers monoclonal antibodies, like
Erbitux, others, is not used as a sole treatment for curative purposes, that I know of, only palliative, but is in conjunction with surgery or radiation. The first line of treatment for a recurrence is usually surgery, plus radiation, and chemo/targeted therapy depending on other factors, and intent.
There are other immunotherapies being investigated with
HPV head and neck cancer, assuming yours is? Here is one trial with imminue therapy for
HPV being done with Transoral Robotic Surgery, TORS, at Mt. Sinai Hospital in NYC just to answer your question.
http://sciencebusiness.technewslit.com/?p=16577Good luck.
