Loneliness is blocking me

Hi friends
I am writing my thesis and it is so hard to focus. I feel horrible loneliness going to the library and writing at home. I'm trying to stay in touch with friends but they are busy. I don't know who to call when things get dark or before that, just chatting. It's frustrating because this is really not the mental state for being productive, it is quite the opposite. I'm drowning in sorrow and fear of the future and think about the past because stuff comes up a lot.
Work days are better because then I can talk to my colleagues.I don't know what to do to not feel so alone. Trying to reach out is kind of distracting me from the thesis, and it doesn't really work. I have struggled with this before and I get so caught up in this problem. Help!

I have written theses so am familiar with what you are going through. I also struggle with feeling terribly alone and sometimes it is an overwhelming feeling.

Maybe try to go do a little work in a coffee shop, or in a different environment and set a modest goal of how long to work. I also found taking breaks like going for a brisk walk would help me focus.