I'm 13 and my eyes move really fast back and forth, and it only happens when I play Rainbow Six Siege (it's a video game). I don't know if it's because I focus to hard but when I stare at a doorway, to wait for someone to peak it, for to long it happens, it scares me because it takes me a second to realize it happens. And I get disoriented for second after it happens, I told my dad and he said he thinks they're mini seizures. I also have these two things that involve my muscles, sometimes my arms just tense up and move on their own and sometimes I feel like I need to flex or tense my own muscles just out of nowhere I feel an urge to do that. Hopefully someone can tell me what this is.