so... here is another case of hereditary allergy problems... since i was aout 10 years old, i've been having to clear my throat every few minutes or seconds to clear any post nasal drip.. at times i don't even think post nasal drip because i feel absolutely nothing dripping into my throat.. i do have a bad history of seasonal allergies and sinusitis. another thing that has been happening is that my voice's pitch fluctuates too damn much.. one minute i can speak in a deeper tone, and the next minute it's almost a whole octave higher.. i'm 17 about to hit 18 and i'm pretty sure that stage of puberty is over.. i tried ignoring the build up of what ever the hell is back there and when i try to speak 1 of 2 things happen.. either nothing comes out, or my voice "cracks." my dad does the same thing ever few minutes and so do my sisters.. i want to be a vocalist but i don't know how i can do it without hurting my vocal chords by constantly clearing my throat and having mucous like liquids building up at the back of my throat... my sisters are both semi-professional opera singers and have the same problem only probably not as bad. the both sing like angels and still have this post nasal drip thing. i some times feel pressure at the back of my throat near my adam's apple when i swallow or when i don't clear my throat (not always).. i stumbled upon a device that is supposed to flush out sinus and post nasal drip liquids from your sinus cavities and the back of your throat...

any idea if that thing can help? any idea if what i have is indeed post nasal drip or another condition? any tips on reducing throat clearing and build up?

any help is much appreciated. thank you.