Lan: I had this problem when I was on Atkins. Amongst other things...

This seems to be a problem for many people on Atkins/Low carb...to the point there is an entire chapter in the Atkins book covering it. Basically, they say you should avoid 'fermented' things....like mushrooms, vinegar, cheese. Which left steak, chicken and eggs to eat on atkins because I cannot have salad without salad dressing and the only kind I could find with NO sugar was a vinegar-based. So, I just stopped Atkins...
I did talk to my doctor about this as well and she suggested a yeast...corrective?...diet and told me that there are books out there that are meal plans for people that have problems with yeast. You might even talk to your doctor about ...lipitor?... the prescription that is for toenail fungus. Apparently, they go hand-in-hand. As well as ringworm. Such lovely names they give these conditions...it makes you feel like typhoid mary!! My doctor wouldn't give me lipitor, though, because she said it was too much medication for too little problem...sure...I get she'd be poppin pills if SHE had a yeast infection!!
Anyhow...hope this helps...Kris