Hi, thanks for your question. I m glad to help with your concerns. Yellow, foul-smelling discharge associated with pain on urinating most likely indicate trichomoniasis, a sexually transmitted disease caused by a parasite. However, yellow discharge also suggests gonorrhea. What i would advise you do first is to visit your primary care doctor. Your doctor would send you for a laboratory investigation which involves taking a swab of the vaginal discharge, and running a culture and microscopy test on it. The result of this investigation would determine which type of STD it is and the appropriate antibiotics to be prescribed. It is only after a vaginal swab is taken that you can safely be given empirical antibiotics such as intramuscular ceftriaxone and metronidazole tablets pending when results come out. I hope i have answered your question. I d be glad to answer more questions if you ve got any more. Warm regards.