Can anyone please help me with this?!

I've been suffering from something called "Depersonalisation" which is something that you feel. In other words, it makes you feel like your in a dream<- that's the whole point. I'm 13 and I've been having this since I was 10 and for me it's not severe because I get them rarely. Anyway I've had one for a whole hour at school today and a whole hour yesterday and I really hate it I try to distract myself but it's impossible to stop thinking about it.
So I looked up more about it on google and found that it's really common and one of my friends has this as well so I'm glad I'm not the only one. But I wanted to know if there's a cure for it if not something to make it happen even less? Please help I want it to stop happening completely.