I think your doctor is an idiot.
The IgM, as you know, is terrible. You should ignore it entirely.
Your IgG tests are conclusive at 16 weeks. You are negative for hsv2. Go with that. I'm not sure why you were testing in the first place, but I don't think you need any further testing, and you should ignore the IgM. It's a low positive, and many are positive when they should be negative, or vice versa. (My own were like this.)
You've had no symptoms, and recurrent yeast infections can be caused by so many things - birth control, antibiotics, wearing underwear with synthetic fabrics, certain soaps, douching, re-infection from a partner, the way the wind blows or planets align, etc., etc.