Eye balls

My 6 year old keeps getting different repetitive behaviours from time to time. 

From screeching noises to running away from the coffee machine. Or putting on the oven and turning it off. He's stopped that now though he's got a new obsession. 

 Hes always liked mirrors, watching himself so I bought a little bathroom mirror for him. Well that was a rubbish idea. While he was in the bath looking at himself in his new mirror he got afraid of his eyes. He now hates his eye balls since he discovered them. 

He keeps touching them or pressing his eyelids nowadays. Quite often. I've even started counting the times his fingers pressing his eyelids. While he watched thomas on YT for a minute I counted to 4 times of him pressing. When he heard me counting he asked me why I did that and I told him I need to write it it in my notebook. He just laughed at me and walked off. He talks about poking them out. Or will they come out if he pokes them? Just things like that. I've asked about his vision and he says can see fine. 

I used to press my eyelids a lot as a kid because I enjoyed the feeling. 

I don't wanna make a massive deal about it because him feeling bad about it will always make it worse.