Losing my voice after signing few songs

I cannot keep my voice after signing few songs, It seems to me that I have something stuck in my vocal cords. Any suggestions to avoid it to happen? It is interesting that it does not have every time that I sing.
Answers
- Support. Breath control is one of the most important thing to relax the voice, so that it doesn't get bound up is the throat.
- Vowel placment. You need to learn to place the sound correctly to be able to grow resonance and avoid oversinging.
If you oversing (sing too loudly, too heavy or shout), if you don't use support and/or pull chest, you'll feel this sensation of binding up in the throat, like you're caught or there is something pulling in your throat.
The best way we can help you is that you send us a sample of you singing (via YouTube or SoundCloud). We could tell you what you're doing wrong (cause if you feel any disconfort like that, it means you're doing something wrong).
Guy Chan
There's a thread on here somewhere telling how to post your songs.