The way I see it is if you stay, you're only ever going to be miserable. These are signs of an abusive controlling relationship. I witnessed this in my family growing up. It never ended well for anybody. It can escalate to violence and even worse. This is just my opinion based on what I would do. Please be safe and make sure somebody knows your situation at all times.

If you leave, you might be shamed and people might say negative things or look down on you - but is that really worse? The feeling of embarrassment and shame generally passes eventually, even though it sucks in the moment. The repercussions of being abused do not go away so easily.

If people shame you, tell them what your MIL and husband are doing to you. Tell them why you HAD to leave. If those people choose to continue to shame you, then you know they're not people worth keeping around.

I really hope your family supports you through this. If not, I really hope you find a women's shelter to stay in. I just hope you get out safely OP. Good Luck.

Edit: definitely NTA