New guy with a couple questions about which parasite this could be please I just need a direction? Mulitple people sick for years

Ok Im lookin for a parasite like Giardia in the USA. If you read all this great if not just any guesses would be great. So my best friend and I got very sick 3 years ago. All the stuff night sweats, lymph node pain(no swelling), joint pain, horrible stomach pains, alota gas(not stinky tho) and really bad diarreha but it didnt float or have a horrible smell it was black from time to time tho along with a wierd warm senstaion. All this lasted 3 years on and off we would feel good for a bit then bad again. We were both plumbers at the time and wernt very hygenic then. Anyway Ive had a ten day course of flagyl and 3 days of vermox and 14 of xifaxan. What does this sound like. I do know my dog got giardia and we have zero idea from where but he was big into lickin my underwear he got this a few weeks after we got him so he was almost never outside yet. I live in northern Illinois but what else could this be like Giardia. Never outta the country just remember drinking out of a hose at sum nasty house we worked on. THANK YOU ALL. I have had EVERY test litteraly you cant think of one i havent had. It took me 2 years after it all started tho cuz of a lack of health coverage. Im gonna go to Mayo as a last effort but after that Im treating myself. What is there that I could get in america that has the exact same symptoms as Giardia but no smell stools Tweet