Why is it that when ever i do humming exercises my voice doesn't change when I try to go higher?

When I do humming i noticed i cant go high, but when I do a norma exercise then i do go higher.Sometimes my voice breaks tho :/ why is that and how do i fix it. Also I know I'm not singing from my throat but right now my throat kind of hurts(after coughing and stuff) and i'm light headed :/ Whyyy?
Why is it that when ever i do humming exercises my voice doesn't change when I try to go higher?
A properly supported and relaxed voice should be able to hum as high as it can sing (in some cases, hum higher and lower). A basic explanation is that when you hum, you are only using your natural resonance spaces to achieve sound and not tensing the throat or mouth to create artificial resonance or falsify the sound.



In simpler terms, if you cannot hum a note you are singing, you are singing that note with improper technique. This will also explain why you are feeling sore and light headed.



The two key issues with all singing is support and space. I'll try to explain an exercise to improve each of those and hopefully you can find a good voice teacher to help you with your technique in a more specific fashion



Support:

In an descending scale (like http://www.youtube.com/watch?v=N6vZrEbmf鈥?/a> but without the ornamented or grace notes. Just straight down the scale) while continuously blowing air through your lips, as if you were imitating a motorboat sound. Make sure there aren't little blips between the notes and that it sounds even and legato. If you are able to do this exercise, you are supporting properly.



Space:

Your tongue needs to be forward and your soft palate needs to be up for proper singing. Take a big breath in as if you are yawning, and yawn out on different vowel sounds. First do this as if you are speaking, but once you are comfortable with it, add pitch and do the descending scale from above. It might feel a little bit silly, but truly feel like you are in a yawn. Obviously, you won't sing like this, but it's a great way to teach your muscle memory what it feels like to have a relaxed throat.