Abnormal vaginal discharge

I have been having this discharge for the past 5 months. At first, I thought it’s a yeast infection even though there were no signs of itching or pain during pee, so I decided to take an over-a-counter single dose pill with Fluconazole from the pharmacy. Few days later, the situation was still the same, so I went to see a Doctor and he prescribed me with vaginal tablets to be taken for 5 days even though I wasn’t found with anything (No yeast infection, no bacterial or fungal infection was found). After 5 days of taking them still nothing changed. This time I went to another hospital, the Doctor took a swab test, from which the results tested negative. After 2 weeks I went back to the first Doctor, this time he performed a Pap smear test on me and the sample was taken to the lab for culture, from which the results took about 5 days to come out. The results came out negative and I was told my cervix and discharge were completely normal. After 2 months of having the same condition, I was recommended to go see one of the best gynaecologists in the country, who took a Pap smear test on me again. The results came out negative and they found nothing, they even did a full body check up and I was told I’m very healthy and fit. But recently, the vaginal discharge has been too much, it’s soaking my underwear, so I am forced to put on pant liners everyday and it still the fluid wets my underwear and sometimes it gets to my trousers. What should I do next? Kindly advice😩 the discharge is slightly yellow and watery as well, no pains, no itchiness