Does anyone know what might cause these problems:

A sweet taste in my mouth; Excess saliva; Occasional dizziness (might 
have been excercise/glasses related); Headache

Googling I find it is either a sore throat, diabetes, 'sick building 
syndrome', copper allergy or weedkiller poisoning. Or anything really. 
These seem to be the symptoms for many proplems and I am stumped.

NHS direct was no help, my GP said it might be a sinus thing, but 
really was not sure.

Any advice appreciated!