I wish to echo Gray D's remark about a singing coach/voice teacher.

In the mid 1960s, I was directed to Julio Barocol (sp?). My voice had been stripping frequently and my throat was shot. Three lessons with him and I never again had that problem. He showed me how to hit some higher notes (I am a medium-high tenor) without having my voice 'crack'. I can't recall what the cost was in money--substantial I think, but it was worth ten times that. After seing Mr B, I was able to sing four sets a night, six days a week without having voice problems. Much has to do with the abdomen and stomach muscles, control of the larynx muscles and proper breathing. I recall having to practice some scales and certain 'loud' sounds. I am aware this info doesn't help you much, but please consider Gray's advice. Promise, it won't be a waste of your time.

As an incidental thing, something I learned from Pat Sky: you can increase the intensity of your voice by finding the key in which you're 'comfortable', and then raising that key by one tone. Best of luck to you, Mr Happy.