I agree with a lot of what was said above. A couple of other things that helped me. You will go through the 5 stages grief - just be prepared for those feelings (therapy or a book can be of benefit). I chose therapy after a close friend’s suggestion; she gave me some great tools. One of the best was when I couldn’t stop thinking about it, she told me to just get up and do anything (drink of water, snack, restroom, walk outside - anything) - to break my train of thought - it worked wonders. Journaling can also help you work through your thoughts and emotions - I don’t like journaling, but it did help during that time. It sounds crazy, but writing things down can manifest them (there is science behind it). I was devastated & blindsided also, but it turned out to be blessing!