Mental trauma by mother since few years

This is about my mother who has been living with me in a rented apartment since more than 10-12 yrs and hve been constantly mentally harassing me by asking for unreasonable financial demands like she keeps saying that buy me a separate house, gold, give me money every month, i am a working independent woman who has a limited income and takes care of each n everything which is required for one’s survival. My brother is married and he stys n bangalore he never takes care of his mother may she stayed with him for couple of months but there has been absolutely no help and support from his end since childhood towards my father and mother, my mother’s sister and relatives and brother his wife eveyone in fact keep asking me money and force me to take care kf mother forever. Im single 33 yrs old and havent been able to get married because of such responsibilities, have developed auto immune disorder since the last 10 years due to excessive stress caused everyday. Please suggest a way out