Yup, this describes nearly to the letter. It's not just fear of living alone, but living without people who support who, and being surrounded by as*holes who only belittle you and treat you like crap. That's been both my fear and my reality for a very long time and it's one reason I have been so pessimistic and mistrusting of people, which makes people treat me even worse and abandon me even more.
I will give you an example, a large part below is from a post I made earlier.
For many years I refused to ask people out as I felt that because I am so unlucky I will always be abandoned and rejected and I told all my family and acquaintances that I will always be abandoned and rejected.
A few years back, this one girl asked me out on a date in college a couple years back and I cautiously accepted as OI was fully expecting her to ghost me and tell me literally last minute that she couldn't make it. So, I told all my friends and acquaintances that the girl was going to ghost me, so I didn't even expect the date to happen. So to ensure that wasn't going to happen, I called the girl an hour before the scheduled date and asked her if we were still on, and I lied to her saying I was on my way, as I was testing her to see if she would ghost me last minute as I told people who I knew, as they all believed it was going to be my first date, but I was so pessimistic that whenever something good comes my way or has a good chance of happening I always used to say, "Ah, it's too good to be true, so therefore it won't happen, and nearly every time, I ended up being 100% correct, right down to the last detail.
And 20 minutes before the movie date, she called me and told me she had work and couldn't make it. I told everyone I told you so, and then they turned it on me saying I deserved it for being so negative and for thinking so poorly of the girl, but the next few times the same s**t happened, and that b***h was just playing with my emotions as she knew I had autism, and believe it or not, that was exactly what I was expecting from the very beginning. I told the girl on the last day of class, I knew her game and that I wasn't as dumb as he thought of me to be, and I told her the truth that I told all my friends and family I expected her to ghost me. Let's just say she was very "hurt" but I knew it was just an act to make me feel guilty for discovering/knowing the truth. It's why I almost never trust people and the rare times I do, I am always proven why I should not trust people.
Same thing happened with jobs, and every time I expect a rejection, no matter how well I do on my interview or how well my resume looks, I still get rejected/denied, and sometimes, they deny me telling me I am not the right candidate, even though I am extremely qualified for the job and have lots of experience, so I do what I usually do and tell people, I told you so and I also predict that they would victim-blame me, so I also record myself predicting that, so when they do, I would play the recording of my prediction back to them, making them eat their own words.
But I was later diagnosed with Borderline Personality Disorder and I knew why I was so distrusting of others, pessimistic, and why I would go to such great lengths to avoid abandonment, rejection or being put down constantly. I was told by my therapist that it was because of my family who always belittled me, and who ignored my emotional needs why I became so mistrusting and pessimistic and impulsive as doing things spontaneously and predicting negative made me feel better, as I felt I had some control or awareness of what is to come.
BPD can be very overwhelming and it's not just the fear of abandonment and rejection, but the wide range of emotions that come along with it, as well as impulsivity and catastrophic thinking.