It burns when i pee only for 1 day. chlamydia & gonorrhoea, bacteria, inflammation test were negative but have yellow/green discharge.what should i do?

Re-exam, more tests?: What kind of "inflammation test"? Even so, colored vaginal discharge (yellow, green, etc) usually means inflammation or infection. Are you at risk for STD, e.g. new or risky partner? Examined professionally or some sort of self testing? Accuracy of gonorrhea/chlamydia test is questionable after only 1 day. Herpes test done? Re-check w/ your doctor, or maybe get second opinion e.g. an STD expert.

Need a wet prep: see a physician and see if they can do a urine culture and a wet prep. This could be trich or BV, which are best seen under the microscopy and trich burns severely and is often yellow green.