Hi. Looks like the acute episode of screaming on the roller coaster ride has created some vocal cord irritation and perhaps some oedema. That can explain the raspy-ish voice. It seems unlikely that the voice is cracking in this manner due to puberty. (Its more gradual and not sudden) The best way to get back your normal voice is by maintaining absolute voice rest for 36 to 48 hours. Voice rest reduces vocal cord movements and allows healing. When you speak the cords vibrate and the swelling persists. If you have cough then use antitussive lozenges to reduce it as much as possible. If it is possible for you to rest your voice for upto 36 hours (ideally 48) then that will help the vocal cords heal remarkably. If you do need to speak then use short sentences and speak in a normal tone. Do not whisper as it creates more damage to your vocal cords. In addition take sips of normal or lukewarm water every 30 minutes to keep your throat moist and well hydrated. Avoid gurgling as it precipitates a lot of movement in your throat. If your voice does not return to normal or improve significantly after 24 hours of absolute voice rest then you will need to visit an ENT specialist for a laryngeal endoscopy to examine your vocal cords. The improvement will also be minimal if you do not honestly rest your voice and put up efforts half heartedly. Do keep me posted on your recovery. Treatment is an iterative process so do give me the chance to make modifications to the management if your recovery is tardy. This can help me tailor the treatment best needed for you.