Recently I have begun to notice that I keep seeing movement in the corner of my eyes. Sometimes it is just a quick flash but sometimes it looks humanoid. Sometimes it isn't in the corner of my eyes but it is as if something small flits across my vision. 

Sometimes when I look I can convince myself it was something normal (a fly, a shadow,...) but sometimes there is nothing that it could be. It is freaking me out a little. It happens more when it starts to get dark and it always freaks me out. It has happened that I could have sworn that someone walked by me while I wasn't paying attention but turns out there is no one there.

I do have some paranoia issues because of my anxiety and trauma so maybe my brain is just being a dick and I am paying too much attention to theses 'issues'. However part of me is terrified that I might actually be developing some kind of psychosis. During on particular stressful period I had a psychosis episode where I was convinced someone was hiding in my room. It was late at night, very scary and felt very real even though rational me knew it wasn't. It ended without incident luckily but I was holding a knife and on high alert so it wasn't a guarantee. I am terrified something like that will happen again. 

I have also had intrusive thoughts combined with some paranoia that have led me to be terrified that someone was following me with malicious intent. It just is not fun. 

I don't know if I need advice or just to vent this and hopefully get it out of my system.