Pain in left side ribs. Please guide me?

It started with severe pain in upper back. From last 4 months i have severe pain in upper back and slight difficulty in breathing. Now from last 2 months i have pain in left side ribs and thightness in lower abdomen and thighs like I did heavy excersice, also feels like constipated, sting sensation in muscles and no sleep. This started when I felt like some friction sensation in abdomen. If i sleep on left side it egravates. I met 2 homeopathic doctors and 1 allupathic doctor. They prescribed me medication for UTI. But each time i took medicine it gave me more pain and dark brown urine. I have done abdomen Ultrasound and Urine routine test and both are normal. My upper back pain has reduced without medicine to 80% but left side and lower abdomen pain is persistent and it is still not diagnosed what is causing me that pain. I am worried because i dont know what is wrong with me and to which doctor i have to consult. Can anyone please guide me?