Struggling Stay-at-home Mum

I am a stay-at-home mum of 2 (6 and 1) with a third on the way. We moved to a new town 2 years ago. Prior to this move I always worked.

I am completely struggling with being a stay-at-home mum and feel like I was a way better parent when I worked (which isn't an option atm because of the third on the way). I have been battling depression and anxiety since my second was born which has seemed to have gotten even worse during this pregnancy. I still don't know anyone here or have any family nearby, I feel completely isolated except for my husband who works and doesn't really understand no matter how much I try to talk to him. We will talk, which usually involves him sitting there and just staring at me, then will pretend the whole conversation never happened a short time later.

I am not enjoying my kids at all, I find myself either yelling at them or hiding myself in a corner, crying. I so much want to get out and meet people, but find that I literally have a panic attack as I'm heading out the door. I have tried talking to close family and friends, with the same old responses of 'you're fine'. I have tried medication, which worked for a few months but then went downhill again really quickly. I am exhausted of life, my kids need better than what give them and I feel like I can't carry on anymore.

Has anyone felt like this and how did you find a way out? I'm holding on by a thread and feel like if I wasn't pregnant I wouldn't be here anymore..
(I know this all sounds so selfish, please know I do love my family so so much and have just gotten to the point where I see how much better off they would be without me)