Hello dear, I can empathize with you..Yes I understand it's your responsibility to take care of your parents...Also the  health related expenses are increasing...Also see when we are depressed everything around appears to be Negative..In reality it's not always true..Take time to visit govt. Hospitals for reducing the stress on you.. whatever you do don't think about results...your mother will feel good if you are happy not otherwise..right... Consult a Psychiatrist for detailed evaluation and Management of the case..