Kicked off insurance early by Ex

I am so beyond irritated right now. I was with my ex husband for 8 years, married for 4 and we have a beautiful 5 year old son together. My ex was a functioning alcoholic who worked late (actually went to the the bar( every night for 3 years and was extremely neglectful, and when I was told by my doctor that my endometriosis was getting worse and I might be dealing with miscarriages in the future I wanted to have another child. I ended up getting pregnant and he  decided we should wait several more years and I was pressured into an abortion. So I asked for a divorce over a year ago. We finally applied for one and I got pregnant with my longtime friend turned boyfriend. He's been wonderful and supportive and trustworthy which I'm not used to. However, my ex started out being nice about everything - we share joint custody and he said I could stay on his medical and car insurance until the divorce was final. I had to take my mother in because she was no longer able to care for herself and it's been very tough financially the last few months with me not working as much. But my exs parents are vindictive. My son went with all of them on vacation this past week, and when they got back tonight I asked when I could pick him up tomorrow. He gave me shit because it's technically his custody day even though he just had our son for 8 straight days and the agreement was I'd have him this next week to level out our days again. He told me I had to give him 30 days notice for vacation time. I literally had to argue with him and screenshot that I had told him I'd be keeping him with me the following week when he first notified me of their vacation. He got pissy and then said he'd be cutting off my medical and car insurance on Monday and to give him his "name back" on Facebook. I had kept my Married name on there only because I run my own business and that's how my customers know me. I've been very nice and accommodating throughout the whole divorce process (and I wish it didn't take so long( but he's obviously trying to be mean at this point. If he didn't want to help and keep me on his policies then he should have not put it in our divorce papers, and furthermore given me more than 2 days notice so I could apply for appropriate resources. I have a doctors appointment on Tuesday which I will most likely need to cancel. Sorry this was long, I am just so tired of being nice to him when he clearly just wants to be a dick. He stalks all of my social media, gets mad at me if he sees a photo of my boyfriend and I (there was only 2 photos in the past tear( and neither were taken by us, they were uploaded by a friend and tries to tell me what I can and cannot do to stop further upsetting him. He's trying to control me and I divorced him to get away from that. Meanwhile, he still goes out all the time, gets drunk and has sex with as many girls as possible.. Which he brags about to me as if to hurt me. I'm just trying to move on and concentrate on making a family and better balanced and healthy relationship for my son to be around and future daughter, and can't take much more of him interfering.