Metronidazole and its cousin Tindamax, are well known causers of nerve damage.
A whole family with chronic diarrhea? Could be other causes there. But it does warrant medical evaluation.
Closely look at your foods. The gums added to most processed foods, including dairy and ice creams (carob bean gum aka locust bean gum), can cause issues for people with a gut biome that ferments this complex carb. Before embarking on the giardia research remove the "gums" from your food intake and see if there is an improvement.
__________________
All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
************************************
.
Weezie looking at petunias 8.25.2017
****************************
These forums are for mutual support and information sharing only. The forums are not a substitute for medical advice, diagnosis or treatment provided by a qualified health care provider. Always consult your doctor before trying anything you read here.