Slowly becoming a beleiver but in the meantime- Help!

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. 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 meds but now its starting again. I really dont want to take medication any more but all these remedies explained on these boards get me very nervous...mushrooms? roots from poisonus plants, stuff from 3rd world countries?? 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. My family is getting tired of me researching day in day out and still not 100% better. We are taking our first family cruise vacation in 2 weeks. What to do.??? Please. Tweet