I cough a lot and have something in the back of my throat a lot and have to constantly clear my throat before talking. This seems to happen quite a lot. I was wondering if it had anyhting to do with the fact that I don't use my voice a lot or because of some other problem. I had to go to the doctors a few years ago because I would get these violent coughs which lasted for about five to fifteen minutes at a time and they would usually lead to me getting nauseous, lightheaded, and sometimes throwing up.  Can anyonce tell me if this is a health issue.