Since you have tested negative 180 days after possible exposure to HIV, you shouldn't worry for being HIV positive.
The vast majority of people (99%) have detectable antibodies by three months after HIV infection, and, a six-month window (period when there are no detectable antibodies, but, person is still HIV positive) is extremely rare with modern antibody testing.
Moniliasis is candida oral infection, that can be caused or related to recent antibiotic or corticosteroid use, diabetic people, ones that suffer from acid reflux, smokers, and people with low immune system due to different causes (not only people with HIV immunodeficiency).