I think I have Insomnia?

Every night I lay down at around 11 and I lay there for hours trying to get to sleep and nothing works. I try focusing on my breathing because its worked for me before but for some reason it just isnt anymore. My mind races and I get one little bit of a song stuck in my head and it replays over and over again and I cant stop it. Once I do get to sleep, I sleep forever. I know Insomnia is when you dont sleep but I dont know what else it could be. I cant take sleeping pills because Im only 13 (I dont know if that matters or not but I thought you should know) and I have Wolf Parkinson White syndrome, its a heart condition, and my cardiologist said that I can only take certain things or else it messes with my heart and stuff. I also think I might have OCD. (Again I dont know if it matters or not) Is there any way that I can fall asleep faster? Is this Insomnia? If not what is this? I really need help:(