Could the antibacterial effect of Dial soap be killing off all bacteria in my vagina? I don't take meds and my diet is the same. A weird odor is there

Unlikely. Unless you are putting the antibacterial soap in a douche, it is unlikely to kill the vaginal flora. However, an odor can indicate the presence of Bacterial Vaginosis. This is treated with antibiotics in the doc's office. At home you can try taking pro-biotics, and eating yogurt with live cultures... Best wishes!