Mexican
I had Giardia infection for about 2 years. My main symptom were the chronic fatigue it caused me,the farting and burping a lot.
I took tinidazol in Mexico twice. It helped me but as soon as I finish it, I got the bloating and the pain back. I tried mexican oregano oil by puting it in empty capsules. It works better than tinidazol.
There is study about the usage of mexicano aceite against giardia in Mexico.