I've been having headaches about 4 days now after starting my medication for "Sulfer burps", vomiting and diarrhea. The medication is Ciprofloxicine 500 (3 slips), Metronizadole 250 (4 slips) and Furazolidone (4 slips). Should I consult my local doctor or is it normal to have such headaches? I self diagnosed myself to have Giardiasis as I had the same symptoms many times before and had positive results in my stool test, so the doctor gave me this medication. I doubt it's the antibiotics.