Hi All. I have been diagnosed with suspected Giardia (awaiting stool test results). I have been on Metronidazole for three days with minimal improvement. The D has stopped but still very nauseous and terrible burning/heartburn. Should I be feeling more of an improvement by now? Or could this be a side effect from the antibiotic? Also heartburn/burning in the stomach a symptom of Giardia? TIA.