Help constant burning

Best way I can show the discharge is by putting a tampon and then taking it out. It’s yellowish and creamie with some blood now. first time tested for sti and bv and yeast. Positive sti I got treated. Went back having the same symptoms. Tested again everything negtive. Test for a uti was negative. They did a physical exam, and they said that my cervix looked irritated, and that the opening to my cervix looks like a skinned knee. I went to the er last night cause the burning and pain was too much. They didn’t want to do a repeat test of the swab STI. They wanted to retest me for a UTI, which I don’t have and know I don’t have. They couldnt help me ethier didn’t even want to do an exam down there and make sure everything was ok. They tested for HIV and syphilis both negative. Inside my vagina feels like it’s 107°.. has anyone ever had this? what helped it I’m stuggling