Am I practicing my vocals correctly?

Hello, so for the past few days I've been singing a lot and today I finally decided to practice my vocals. So I searched practice vocals on Youtube and I found this https://www.youtube.com/watch?v=ZAx0UF_k2hM It was a twenty two minute practice session and after I did it my voice started sounding weird... show more Hello, so for the past few days I've been singing a lot and today I finally decided to practice my vocals. So I searched practice vocals on Youtube and I found this https://www.youtube.com/watch?v=ZAx0UF_k2hM
It was a twenty two minute practice session and after I did it my voice started sounding weird afterwards, When I was talking at first and then it cut out and I wasn't able to speak normally until like 30 seconds passed. And I tried singing in a high pitch sound but it was cracking, I could still speak right now but if I try to sing it won't sound good.
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