Lower left abdoman, back pain, frequent urination is little bit foamy.feeling something empty and dry in the both side of abdomen after urinating.

See answer: Unable to make a diagnosis on basis of only your symptoms. Certainly a UTI would be definite possibility. Typical UTI symptoms: urinary urgency, frequency, voiding small amounts, burning with urination and bladder pressure lower abdomen. If UTI extends into kidney: sicker, fever, chills, flank/abdominal pain. Also, number of GI or gyne problems can cause abdominal discomfort. Need further eval.