I have had a similar problem over the last year or so. When I talk, sometimes I have to cough or clear my throat - and it was affecting my singing which I really enjoy. does this sound similar. Anyway I went to the Doctor and he said I have "Reflux". So I have been taking a medication similar to Gaviscon, which takes away excess acid in my stomach. Some people with Reflux get heartburn etc, Im not as badly affected as that, in fact Im generally very healthy, but I love singing / going to Folk Clubs etc and was very concerned. Anyway the medication has helped, it is called Peptac and can be bought at Lloyds chemist for £3. Hope this is helpfull.