it has nothing to do with your sexual indiscretion.
Yeast infections happen all the time in women, and they often come and go.
1) Yeast infections have no effect on chlamydia, or vice versa.
2) Low risk, as you discussed with Dr. Hook, but not zero. Were you tested, as he recommended? What did it show? Even if not tested, it probably doesn't matter; in men, chlamydia generally clears up on its own within a few weeks or months.