Is it normal that i have a scrambled brain and random thoughts

i'm not sure if it's normal that i can't think at some times.
I have ADHD but i'm on medication for that but this is like i'm hearing things and thinking of random things. But most of the time they're mixed together like an old memory will be mixed with some scene from an action movie while i'm also thinking about animals and how i'm gonna say certain stuff. But all at the same time.

I also feel like i can sense stuff that just isn't there. Like i read in some other post where he said he felt like there was a spider somewhere in his bed. Well i feel like that but with people are all around me or there's a snake that's following me or i just know that there's someone there. Not like i feel it but as if i just know.

I don't know if these two things relate but it would be helpful to know or if the sensing stuff is just my mind being scrambled and doing this.