Have Been On Antibiotics For Over 2 Months For A

have been on antibiotics for over 2 months for a recurring sinus infection that doesn't get better. Now my heart is off he ekg charts, shallow breathing, brown teeth, metallic mouth with weird colored tongue. My heart specialist appt isn't until Jan. 8th, so I started my own research. Would it be wrong for me to ask my MD o order a MRSA test?
I seem to have all the symptoms.