I am 21 now, and since I was 6/7 I've experienced very specific anxiety issues. For context, I have been diagnosed with depression, anxiety, and autism, but have never really discussed the more specific anxieties with any professionals because it's always felt childish and embarrassing. Also don't have any childhood trauma that I know of, or something that could have triggered this. I still experience some of these things but to a lesser degree, compared to the constant sense of danger it used to be.

When I was younger, I started developing specific fears and paranoias, in addition to early signs of typical anxiety and depression. The worst one is that I was afraid of sleep, thinking I would have a nightmare that night even though I didn't have them that often, as well as being afraid of closing my eyes when alone. This turned into me keeping myself awake for as long as possible, sometimes being sat up in my bed all night or walking around my room, only falling asleep when I was exhausted or my parents sat in my room to make me feel safer. Now I struggle to fall asleep naturally by just closing my eyes and trying to sleep, I have to be watching a stream or video and drift off randomly. 

Additionally, I was afraid of the dark and having my back turned to the room. When I was really bad, I'd spend hours just looking around my room, afraid something was going to suddenly be there such as a monster or creature of some kind. Even now I still get anxiety in a dark room and feel uneasy, and I hate having my back to a room. Especially on my own, I find myself checking behind me a lot or worrying that something might be there.

There were some more unusual ones, I was afraid of mirrors. If I walked past one or was in front of one, I had to be staring at it constantly, because I was afraid something would be there if I looked away. When going to the bathroom at night I'd have to run past the mirror because I was so afraid of it. I was also scared of the sound of a toilet flushing and the bathtub draining, and I really don't know why.

Are these experiences other people have had? I don't know if it's just manifestations of my anxiety or something else, I haven't really seen anyone talk about this kind of stuff.