So sorry for your loss and it's so new and overwhelming. I have noticed many times what a devoted caretaker you were to your wife. Always caring for her, no whining, no complaining just compassion. Care taking is hard work that leaves little or no time for the care giver. In my several stints of care taking split between several decades I know care taking gives and takes away at the same time. It gives us compassion and active serving for others and yet it can be overwhelming ,stressful, and soul sucking .
I remember when my DH has his surgery event, upon release they made the comment for every day you spent in the hospital count that as a one week you will need to get back to feeling more physically and emotionally normal. The same might well be said for extended intense care taking.
So AJA... set yourself a slow and steady pace with no pressure no expectations. Just let yourself rest, heal and remember the good times when you can. Will everyday be a step forward, no it won't but at some point you will have more good days then bad. I have had several difficult losses this year and like your DW they involved extended illness and hardship. As a person of faith I have repeated this verse to myself many times, to comfort me that my loved ones are now at peace and without pain.
Luke 23:43 ESV
And he said to him, “Truly, I say to you, today you will be with me in paradise.”...
May today be a good day for you.