How can one deal with an angry mother who curses her son and feels discriminated against in the way she is treated, and does not believe his difficult financial situation, and mocks his religious views, which makes him think about shunning her?

What you are experiencing is a trial, and what is obligatory upon you is patience. What will help you be patient is knowing the reward for patience and for honoring parents, and the punishment for disobeying them. You can ask one of your siblings to mediate between you and your mother to inform her of your true financial situation. If she insists on not believing you, then you must be patient. Beware of responding to her anger with anger or by raising your voice, as this is a forbidden act of disobedience. Do not expose yourself to her supplication against you. When enjoining good or forbidding evil with her, you must be respectful and gentle with her.