Sleep and dreaming

My dad died from a heart attack on September 4th. He was 55 years old. I am 25 years old. I live in Arizona, and my dad lived in Tennessee. I went to Tennessee for the service, which was two weeks ago yesterday. That was hard. My dad and I were really close when I was young. The last time I saw him alive was January 2018. After I moved to Arizona, I had only gone back to see him once. I tried to convince him to come to Arizona. I told him it made more sense for him to come to me because he could actually rent a car.
His wife told me they had been planning a trip before COVID. They had saved money... they wanted to come to Arizona for 2 weeks to see me and my brother.
After the service, I keep picturing his body. I dreamt about it... his body was following me back to Arizona in the dream. I don't know how to focus my mind on other things.
Some nights I sleep and some nights I don't sleep as well... any advise?