Just need some conservative Advice Andreas

Dear Andreas, Im new to these boards and I heard you were wonderful. I have been trying to get in for some time now. Anyway, here is my story if you can take the time to read...
I beleive I am fairly healthy at my age 46 female. Always saw MDs with checkups. I have had bowel issues for about 4 years now. On...off...weeks of great digestion and BMs no matter what I ate...junk or health food then days of diareeah and then constipation, mucus spits (sorry). Knarling pains on and off but not debilitating. Last month after stool spec. taken I was diagnosed with Giardasis. Dont know where on earth that came from. MD gave me Flagyl. It made my GI tract horrible. Felt great for several days after finishing the meds but now its starting again. Im afraid the parasite mite still exsist. I dont want to take the antibiotics again.I turned to these boards but all these remedies explained on them get me very nervous...mushrooms? roots from poisonus plants?, stuff from 3rd world countries?? I am a bit skeptical and I dont want to fall into traps and dont want my body to get sicker if it is more vulnerable. I would like to take some herbal remedies but none that will strip my irritated intenstines. I wont and cant do any cleanses cause I cant be stuck on the t-bowl all day. I do take a good probiotic once a day with a multi vitatmin and now will start with GSE and/or Oregano Oil. I dont really know how much of each to use. I can use advice on that. My MD was on the book of "voted best doctors in the Northeastern region" I will eventually get more aggresive with herbs and natural cures but for now I need some good solid advice and I will slowly go to alternative medicinal cures. My family is getting tired of me researching day in day out, getting myself all worked up seeing the posted photos and still not 100% better. We are taking our first family cruise vacation in 2 weeks. What to do.??? Please.