i don't know if it will help but maybe a humidifier will stop you having such a dry mouth?http://www.amazon.co.uk/Vicks-V-610E-Warm-Mist-Humidifier/dp/B000LN5FZ6/ref=sr_1_3?ie=UTF8&qid=1333878477&sr=8-3
mate i feel your pain, im exactly the same! my throat swells up during the day too though, hurts mainly when i swallow, is it the same for you?