Homeopathy is a system of medicine discovered over 200 years ago by Dr. Samuel Hahnemann in Germany. For a historical discussion of various homeopathic drugs that have been incorporated into conventional medicine, see Dr. Harris Coulter's Homoeopathic Influences in Nineteenth Century Allopathic Therapeutics as well as his more detailed book on homeopathy's history, Divided Legacy: The Conflict Between Homeopathy and the A.M.A.
While this skepticism of the efficacy of small doses of medicine is understandable from a strictly rational perspective, it ignores the large body of evidence from basic science, controlled clinical studies, epidemiological data, clinical outcomes trials, and historical review of the field.
An article published in the Journal of the American Institute of Homeopathy in May 1921 states that Dean W.A.Pearson of Philadelphia collected 26,795 cases of influenza treated by homeopathic physicians with only a mortality rate of 1.05%, while the average conventional medical approach had a mortality rate of 30%.
Immunizations and allergy treatments are given to prevent or cure special ailments, while homeopathic medicines are substances individually prescribed based on the overall syndrome of body and mind symptoms the person is experiencing, and therefore a homeopathic medicine is thought to strengthen the person's overall body-mind constitution, not just to prevent or treat a specific illness.
Even though it may be very worrying, look upon it in combination of your other symptoms, major and minor, that came on with it. If you can make a list of all these symptoms, and then match it to the strong keynotes of a homeopathic medicine, then it will most likely disappear, along with the other symptoms.