Urethritis still after 4 years

Hi All, im new here and i will try keep this short!

4 years ago i had symptoms of urethra stinging, urinary frequency/urgency and brown/redness discoloration around opening of urethra snd discharge

i tested positive for chlamydia and urethritis, the Antibiotics (1 pill of azithromycin and 1 week of metronodizale) got rid of the stinging and urgency. i went back to the GUM clinic and all the doctor did was say ' there is no discharge and chlamydia can be residual,nothing they can do and go to GP. more Antibiotics for a week from GP done nothing.

had a cystoscopy done and the urologist just said my symptoms are because of the urethritis i have. i went back to the gum clinic last week to tell them this, i am waiting results from a urine and blood test, the nurse said there was no discharge to look under the microscope with but she did put a syringe in there to take a sample of something so not sure what she is checking for there?

the nurse also said that there are some ' bugs ' they dont check for like mycoplasma etc

im just wondering what this brown discoloration could be round urethra opening.. fungal infection?

is there another STI i could possibly have that is keeping the urethra inflammed for all this time? seems unusual i have had the same symptoms for 4 years. i have heard that trichomonas can cause urethral inflammation?

is there any natural home remedies like poultices i could use on the urethra that are antiseptic,anti-inflammatory,antibacterial, antimicrobial that will kill the bacteria responsible and disinfect the area.

dr schulzes deep tissue oil looks good but says to be cautious in sensitive areas! although i have seen people say they would use it there as its diluted in a carrier oil.

any suggestions would be much appreciated :)