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Can any vocal teachers help me???

ok im a 17 year old male and i sing in my head range.."you know what i meen" and i can also sing whistle reggister also...but i also have very bad sinus and allergies and now when i sing my voice cracks more often and when i go into my high notes i cant do it as easy...but i kno i can still do it....but i just need some realll voice warm ups for someone like me to open my voice back up and my ranges...becouse my uncle is tryna get me in the studio to sing for some producers...and my voice closes up even more cuz im nervous so ya kno....can someone pleaseeee help me out!?? i really need the help...