Lower back and abdomen pain. Pain!

I continually have Lower back and abdomen pain, abdomen pain more feel towards ovaries position. 3 month back I had UTI since then I monthly done my urine culture test but it always come negative but I still have this pain. Back pain is more severe then lower abdomen. I some time also feel urge to pee as soon as I drink water it become more severe when I consume alcohol. But my urge to pee reduced by the time I also have regular constipation and feel more gastric but that was with me longer then this pain and I never felt like that before this pain was with me since my UTI and it's not going away. I have also done ultrasound everything was clean there as well. Can someone please help me to understand what could be the possible cause for this constant pain