Thank you, everyone, for your warmth and your insights.
It was very interesting to learn about a new term 'hangxiety', I have heard of it before.
I am slowly doing better. However, I struggle to know what will I do with my free time, especially on weekends. For me, despite loving life, it is so damn boring and I hate being alone. That's my trigger, I want to shut my brain down to be able to avoid spending time with myself.