Yellow discharge, vinegar odor and itch. all tests are fine. ?

Which tests?: Yellow malodorous discharge associated with itch is not normal, and should be evaluated. I am not sure which tests you have had that are "fine". You should be tested for vaginitis caused by bacteria, yeast, or trichomonas, and also for sexually transmitted diseases including gonorrhea, chlamydia, and herpes. If these were all negative, consider having tests repeated.