Threat from Mother-in-law

I am married for 11years to a Menon family with our parents agreeing to the marriage. I was not asked for dowry but there has been talks about the same later. My inlaws lived in Abudhabi and worked there in the medical field, with their earnings they build a house here in Bangalore. This house has contributions from my husband and his brother as well. On their visit to here, there has been constant fights between his mother and me for small small issues, like the house is not kept clean, there is dust everywhere, etc. Now they both are retired and are living with us here in this house. Though the house is in her name, she constantly keep taunting me about the difficulties she went through to build a house like this. This has reached to a point where now from last one year or two, she and her husband keeps troubling me to be a maid in the house, take care of her husband and her sons,do all the house work and then sit at home and not to go to work and not visit my parents also. Everytime there is an argument in the house, she keeps threatening me to get out of house,go look for my source of living,if I need to stay here then I should do all the house work and stay at home. I am a emotional counsellor, and work in a decent job,was also working as a teacher. I was shamed for my profession and the family I come from, I am from a viswakarma caste.I feel scared about the mental abuse and i am exhausted at the same time. I have a son of 11years, and husband is also supporting me.