So very sorry to hear of the loss of your wife. Sending you a welcome hug.
You sum up very well what it feels like to be in that early period of grieving. I am so sorry. It brings back the memory of what it felt like a couple of years ago for me after I lost my mum.
There isn't much I can say to help you feel better, other than that all of us here understand how you are feeling and hard as it may be for you to believe now, it does get better. How long that takes and how hard it is to walk that road though is just a terrible journey that we all have to make at some point.
The only advice I can give is that you try to take care of yourself and try to do anything that helps. For me, that was having flowers around to lift my spirits a little, walking in the park and sitting on a bench to try to take it all in and putting together an album of pictures of my mum to look at when I needed to. It also helped to write down what I was thinking about and how I was feeling each day. Writing does seem to help and I think it might help you to try it. It somehow seems to help get some of the weight and stress of it all out of your system.
Try to eat and drink enough and remember that your wife will always be with you in your heart and in your memories and so will never truly be gone from you. Going forward, try to think what she would have wanted for you and gradually try to show yourself the concern and love that she would have done, in her memory and in honour of the life you shared together.
We are here for as long as you need us.