What Causes Headaches, Rashes On Skin And Loss Of Hearing?

we traveled to Florida in jan, 2008 and in just a few weaks after we came back my son started complaining about a piercing generalized headache and stiff neck I took him to doctors repeatedly until one finally listened to me and did tests on him. IN 2009 he developed a skin rashes, that mimic exczema and was put on meds for this we tried five different kinds five different kinds until one worked in late 2009 we did stool sample test only to find that my soon had Entomoeba coli cysts, traphozites, and protazoa he was put on metranidazole for ten days and his headaches went away for two months. Now his headaches are back and so is a skin rash on his upper chest He also woke up one morning with loss of hearing in his one ear I've been doing alot of reading on this and read that you should follow ten days of metronidazole with an antibiotic to completely eradicate this parasite please give me advice I am very worried for my sons health