Why is the color of my urine consistently yellow from a year?

Hi doctor,

I used to get mouth ulcers and throat infections frequently for one and half month, then my chest, back, and palm started itching. After which, I started getting blood in urine, and burning sensation during urination. My urine color changed to yellow, and it started to smell a lot. I have done all the sexually transmitted disease (STD) test except human papilloma virus (HPV) and gonorrhea, and all were negative, even urine routine and culture were normal. So, I started taking antibiotics for urinary tract infection (UTI), as prescribed by my doctor. Three months back I started having severe itching and rashes in my thigh. I am using B Bact and Candid B for the rashes, but it is not getting cured completely and is also spreading. It gets cured at one place with the ointment and comes in some nearby place again. I stopped the antibiotics from past 2.5 months and then found white discharge from the penis, from past three weeks. Even after urinating, I have the urge to urinate again. Sometimes, my left knee pains as if it has dislocated. I am not able to walk for few minutes, but the pain goes after few stretching and rest. I also get right lower abdominal pain abdomen at night. It has been one and a half years since this started. I am unable to find a proper diagnosis or cure it. My urine color is constantly yellow from the past year. The yellowness goes with drinking lots of water. But every morning the urine color is yellow, no matter how much water I had the previous night.