I saw my brother's face in customers at work, people driving next to me, etc. That happened several months after he was killed. These days, (almost 2 years), I see little kids that look like my brother when he was their age. It's surreal.

I have nightmares of my brother staring at me from the street he was killed. A car lighting his body before he got hit by that car. I'm jolted awake. It's a little terrifying.

It might be the combination of you missing your best friend and processing your grief, as TerryL stated. And I agree with key_tones. Having a support or people to talk about it with, helps through the process.

I'm so sorry for your loss.