I Have Been Having Goopy Thick Vaginal Discharge For Months.

i have been having goopy thick vaginal discharge for months. i am 59 years old. i had a uterine ablation done over 15 years ago as i had large vibroids in my uterus. i have had no problems or breakthrough bleeding. i went get it checked and she put me on some antibiotics and some yeast "bomb" pill..it does not itch so it is not yeast. The meds cleared it up for about a week and it has come back and sometimes it is a light brown color. Could it be that the fibroids have started to disintergrate and are causing this to show up? I do not have any sexual activity and have been celebate for a 2 years.