I'm not an adoptive parent so I hope you don't mind me responding, but I can somewhat relate. My daughter was born very premature and spent 9 weeks in hospital. For those 9 weeks, all I wanted was for her to come home and for us to be a family. But when she came home I felt exactly as you describe. I would wake up having panic attacks. I would hyperventilate in my sleep when she cried. I didn't want to hold her or feed her. I think a lot of it was fear. I was terrified of being responsible for this human who was reliant on me. What she needed was a Mum and I couldn't be a "Mum" in the way that I thought I should be. I know it's not the same as adopting, but so much anticipation and building up to that moment when you can take them home puts a huge amount of pressure on making it "perfect". But "perfect" is just a concept. It's how parenting looks from the outside but, in my experience, is rarely how it feels from the inside. It's hard work. It's physically and mentally exhausting.
I accepted as much help as I could. My Mum was fantastic. And my health visitor was also great. As a lot of my feelings came from fear, it became about doing it anyway. In small steps. I would make myself hold her at least once a day. I would do all of the practical things - making up bottles, sterilising, laundry etc - for her. And gradually I would challenge myself to do more and more with her. In the very early days with a baby, you don't get a whole lot back from them, so it does feel somewhat thankless. But over time, you start to see little bits of interaction and that makes it easier to bond.
Can you access counselling in any other way so you can see someone sooner? If only in the interim.
Aside from that, try to get some sleep, make sure you eat ok and try to get some time for yourself.
I can't fully relate, but I do think that what you're experiencing is normal for many new parents, no matter the circumstances.