Triggered by darkness

I remain ok til sunset. Then as the sun leaves. Anxiety and dark feelings are hosting my body. I get very tired. Lose motivation. I feel some sort of captivating fear that I can't shake away. I look around and everything looks different. I don't recognize anything anymore. What is a safe space at daytime is a chamber by night. I don't know how to handle this. Or why it happens or why it never gets better. I hate nights, because they have no light.