It really does sound like you need to find your own place. It sounds like you need your own space to parent your way without someone breathing down your neck. I'm sure if you try hard you can find somewhere?
I agree with Pp about talking to your partner and have him talk to his mum.
Unfortunately parenting is about cleaning, cooking etc and we don't get much of a break! That's unfortunately by going to change when She isn't there.
Hope you sort this out soon x