Im so sorry you had to go through that.
Personally, I think it was a combination of events throughout my life.
Earliest anxiety memory was going to the babysitters (which I was in full time), she would force me to eat meat (because I could never swallow meat). I would sit there for hours. While the other children played in the playroom. I felt embarrassed around the other kids. I must of only been 3 or 4.
Then in prep (was 5) at recess I wanted to climb on the pile of woodchips (they were prolly re laying the playground) so I ran up the top of the pile and some big kids pushed me off and I fell face first into mud, I tried to get up and they kicked me down again over and over.
I was always forced by my mother to play with other kids in the neighbourhood, or my many cousins. I hated it, because I would always feel scared of other kids.
In grade 5, I had a horrible teacher, that would always make an example out of me, he was also our PE teacher, he made me run twice and the other kids only once. I felt picked on by the teacher.
So then in high school, I wasnt really bullied or called names etc, but made to feel invisible and ignored. We had 2 seat desks, I would always have to sit alone. When we had to pair up, Id always be alone, and always the last person picked at P.E/Gym. I dreaded when the teacher said 'okay pair up'. No one really acknowledged me and the group of girls I did hang around at lunch breaks were just people I tried to stay close to because if I didnt have someone to hang around, Id end up in the library, hiding behind books (not that I was into books, it was just an escape). They ended up being total *****es.
I think my parents played a part in alot of my anxiety too. My mothers has no empathy, I think narcissistic and my dad is a perfectionist (possible OCD).
I never felt good enough or that what I did was ever good enough. I feel like they put high expectations on me and when I failed them everytime, I was nothing to them anymore.
I cant name every event, because some are just so hard to explain. But these are the stand outs.