Scared by a dream

I was very tired today, so I went to bed early, but I was awakend by a nightmare (terrible dream). It scared me so much, I couldn't go back to sleep. I got up to do something (to distract myself). So here I am, writing this.

And I have a question ,I hope someone can help me .
if you can miss someone ,although you live alone ,but you can say you are lonely .
I want to know how to express this sentence more clearly/better/effectively. 

I'm not sure how to translate the sentence in red. Maybe being lonely doesn't translate the same in English. Because you can be in a relationship with someone, and live with them, but still feel lonely if they don't pay you enough attention, or satisfy some intimate urge.