Help. Burning and no clue what it is.

So i have encountered a new issue. After the last few times ive had sex, it feels like my clit is constantly burning. It’s a burning and cooling feeling, really weird. I went to the doctor and found out that i dont have a UTI or yeast infection. I also got tested for STDs and EVERYTHING. The doctors havent helped me out whatsoever. Wondering if this has ever happened to anyone else, on the hunt for answers . thanks :)