Perplexing Continue with the counselling by yourself, as it's important for you. He is obviously not going to be supportive, so you need to rally support around you in other forms. RL if there is anyone you can trust, here on MN, and your counsellor of course.
First of all - he doesn't get to choose whether or not you take meds for depression. Your illness, your choice. If you've been put on meds, then give them a chance to work. Do not allow him to talk you out of it. Rather than getting into an argument about it, I'd recommend you detach and ignore on this issue. It's not something he has ANY say in, so don't allow him to. He can talk until he's blue in the face, but unless he physically intervenes when you're taking the meds, just ignore him. (and if he physically intervenes, it's a whole different issue)
Secondly - if he's this way towards you, it's likely he is verbally/emotionally abusive towards your DC. Just be aware. He's obviously involving your DC in your arguments, so that alone is emotionally abusive and not good for your DC.
Third - Document everything. Somewhere safe where he cannot find it. Online, password protected, using stealth mode (incognito) when you're browsing online, and clear your online history. Very important. Abusive people can get really dangerous when they think someone under their control is slipping away from them and trying to be independent. The documentation serves a couple purposes - it will help you remember things if you end up separating and have to go to court for divorce, and it will prevent you falling for gaslighting as you will have the facts written down.
Do not beg him to interact with you. I know it's frustrating and painful to be shut out so completely, but he seems to be taking pleasure in creating mental anguish for you. Do not hand him this scenario to play with. He will only use it against you.
Make sure that you take your meds, continue your counselling, and take good care of yourself. The last thing you need is him attempting to use your depression against you regarding your DC if you separate. Continuing to do what you need to do to remain healthy will show that you are a stable and mentally competent adult, and capable of parenting your child.
I do think that quite a bit of your stress would eventually be alleviated if you did LTB. It's obviously your decision, but stop and think about what he adds to your life. It sounds like he adds much more negative interaction and stress than he adds positive. He is actively trying to negate your progress with your mental health (trying to discourage your meds) which is a huge issue. Remember, it's not just the blow ups that are going to be affecting you, it's going to be the long term daily stress of "what is he going to say about this?" and "what is he going to do next?" that will also wear you down. Separate, and this kind of stress will drop dramatically.