yeast infection entire pregnancy - help!

vermont7

I have had a yeast infection since the start of this pregnancy for some reason and cannot get rid of it. I waited until the second trimester, around 18 weeks or so, to treat it the first time. I used rx terazol for 3 days. Gone for about a week. Then I got bacterial vaginitis. Week of antibiotic for that = another yeast infection. 7 day terazol cream. Now a week later, I am using another 3 day cream. I am really irritated inside and am nervous about the baby getting thrush and how it will impact our nursing. I had such an amazing birth and breastfeeding experience with my first, that I really want that again. They have tested my sugar levels, and they are fine. I am trying to cut out a lot of sugars and carbs from my diet, eating plain yogurt everyday, and taking an acidophilus pill. Why is this happening to me this pregnancy? What else can I do? Anyone else have recurrent yeast? Also posted in third trimester