help me figure out these "episodes"

hi reddit. i experience these "episodes" that no doctor has been able to explain. I have been to psychologist, psychiatrist, and neurologist with no information so i'm wondering if any of you have experienced anything similar. These episodes always come out of the blue, but most always when I am stuck in silence or left alone, and it is a sensation of screaming in my head with distorted perceptions. It is no auditory hallucination, as I am not hearing anything literally, but the only way I can describe it is the terrifying feeling you would get if a bunch of people were screaming as loud as they can in your face. it's not easy to explain unfortunately. everything seems to be moving 10x faster than reality, I even catch myself moving faster. My perceptions are altered making everything seem super big or super small. It is almost as if the silence is literally "deafening". The feeling is so intense that when it lasted more than a few minutes, I admitted myself to the mental hospital. they were useless. im curious if any of you have experienced anything like this.

I experienced these episodes a few times as a little kid, but not often. Now I experience them almost every time I am alone and/or left in silence. I am diagnosed with MDD, generalized anxiety disorder, ADHD, and bipolar disorder (cyclothymia). I had a brain injury when I was around 15, which caused every mental illness that I currently have.

A neurologist ruled out seizures, because they usually only happen when I am alone. My psychiatrist said this could be due to my brain injury- which would make sense- however, these episodes began before I even got the brain injury. My psychiatrist then said that if it's not from the brain injury, then it is psychosis. To me it feels like psychosis solely because of how INTENSE and terrifying this feeling is when I get it. But they are usually not accompanied with clear hallucinations or delusions, so I don't know.

one question is- for those who have/ experience psychosis- did it begin subtly and progress in intensity over time? I feel that I have it small now and it is gradually getting worse and I fear it growing into further psychotic episodes as I age.

thoughts?