sorry to scare you, but I would NEVER try and stretch your voice. If you're not meant to sing high, forcing it out will NOT make it any better. Get checked for nodes RIGHT AWAY if you have a lot of symptoms, you don't want to completely lose your voice over this. Just be careful with your voice and don't oversing because it's not good to damage your voice over a couple of high notes.
Good luck... ~kangaroo
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