Diflucan and yeast infection

I am 26 weeks pregnant and doctor found that I had a yeast infection. She prescribed the one dose Diflucan, assuring me that it was safe in the later half of a pregnancy. The morning after taking the pill, I woke up with the worst stomach pains I have ever experienced in my life. It felt like someone had punched me in the gut. The only relief was when I'd have a BM. The pain lessened each day and as long as I didn't have any dairy products, I felt OK by the 3rd day after taking the pill. I read that lactose is in the pill - I am semi-lactose intolerant, so I'm assuming that is the cause for the incredible stomach pains. Also had a pretty bad headache the first two days.

Diflucan cleared my yeast infection within hours and I felt great but did experience itching over most of my body but most severly in my vaginal area mainly after urination. I figured out that if I would cleanse myself with just a cotton cloth and cool water it felt better and the itching subsided until the next time I went to the restroom.

My side effect was that I woke up after using the one day dose to treat a yeast infection, with a rash on the outside of both of my thighs.