Shady In-Laws

Been married 6 years and my in-laws have been the cause of all major fights. Convincing my husband to give his siblings money (I didn’t find out until after), making career-related decisions that affect our family with them instead of me (large business-related purchases with them), asking me to sign shady documents that I don’t understand, and continuous passive-aggressive jabs (mostly by my MIL). I finally put my foot down and said no after receiving a postnuptial agreement from my in-laws. What do I do? My husband tells me I’m “overreacting” every time I express my concerns. Says his parents have no bad intentions. I had a lawyer look at everything I’ve signed (and the postnup), and he echoes all my concerns - said it’s clear my in laws do not respect me or my marriage and are taking advantage of me. I love my husband but I can’t take this anymore. He refuses counseling. His parents have controlled his whole life so he doesn’t think this is a problem. I don’t know what to do anymore. Has anyone divorced their spouse because they can’t handle their in laws anymore? Is this fixable?