I suppose that I am not making bad progress given that it is only two months. My daughter got a golden retriever/poodle cross pup for Christmas and, while I like dogs, they are too high maintenance for me. Another daughter gifted us with a friendly cat when her company transferred her to Japan. My wife immediately became her favorite person, but she tolerates me, keeps the house free of mice and is an easy chair cuddle companion when I wind down the day in the evening with supper and a little tv (mostly old movies, programs or documentaries).
I wasn't much of a church goer, but my wife dragged me to hers and I have a few friends there as a result. So I will probably continue when I get back home after the holidays with my daughters.
There was a time in my life when I had several friends who had gone through divorce - some in "good" marriages, some in "bad" marriages. They all said the same thing, "Getting divorced feels like losing a spouse to death, and grieving the loss of that spouse takes about half as long as the length of the marriage," ie: 5 years of grieving for a 10 year marriage. You have suffered the actual loss of your dear wife, you need to give yourself far more time than two months for the grieving process to be completed. I would wager that for you, the grieving process has barely begun.
When a man and a woman marry something profound happens, "The two become one." I don't think we(humans) can fully understand that, but I do believe we are able to sense it in a very real way. It seems to be especially true for those who are in a solid marriage which your words lead me to believe you had. You have lost half of yourself, and I would guess that you would say the best half of yourself. After 38 years, it is going to take some time to heal. Don't be surprised if, two, three, four years from now or even longer, you find yourself crying(maybe even weeping) for no apparent reason. Also, don't be embarrassed by it if it happens. After all, it is not uncommon in our culture to think that a crying/weeping man is not a man at all. Just know that it is going to take time(lots and lots of time) to process your loss.
If you haven't yet, spend time talking with your daughters about the loss of their mother. They are probably hurting as much as you are, and there can be benefit in talking about a shared grief.
As a fellow introvert, I would recommend not spending long periods of time alone.
Words really are inadequate at times like this. May God bless and comfort you during this dark time in your life.