Are my vocal chords damaged?

I am a guy. Okay so I have been finding out all of these weird talents I have this year and last year. One of them involves pushing the word "yah" to the point where it becomes a shriek. I used to do it a lot but then my voice started getting sore. So I stopped. Know thinking back I hope I didn't hurt or ruin my vocal chords. I love to sing and I usually sing Tokio Hotel which is somewhat higher pitched. I find it harder to sing as long and as well as I used to. I don't know if its because of that or maybe just not getting to bed early enough. But I'm afraid. I want to keep singing. If in fact I did damage my vocal chords will they heal over time? Or what else can I do? Thank you all so much for your answers in advance.