55-year-old mother with diabetes, leg pain, and difficulty urinating: Seeking specialist recommendations

Hello My mother's age is 55, she got diabetes detected past one and half year. Her height is 5 ft and weight 66.5 kg. She walks a lot but she get's exhausted or sometimes in Hindi ( Dum lagna / Saas Fhulna ). Her Legs pain a lot especially foot sole. Past more than 10 years she is on tablet lasix 40 without which she is unable to pass urine ( daily one tablet ) on some occasions she has to take two tablet as urine do not pass. ( when urine do not pass her body, legs, face and stomach gets swollen and difficult in breathing ).During this years we had been to some many doctors to cardiologist, Nephrologist, General physician ( with so many test of blood and urine ( her sonography had showed Fatty Liver ) but this urine problem was never solved. some Doctors advises not to take Lasix 40 instead another variant tablet of low power but that didn't work. we are not financially strong to taker her abroad to know the exact cause and diagnosis. I don't know when shall she can pass urine naturally without any medicine. Could you please suggest any special doctors where they can resolve this problem?