Hi Jean from a fellow UK sufferer.
I've been using the machine for just over a month. The first 10 days were a nightmare, I was very uncomfortable and just couldn't sleep, and often ended up taking the mask off. I felt no improvement to the symptoms and, like you, developed a sore nose (inside and out), dry throat and got a blocked up nose.
I then discovered this forum, plus amazingly 2 other people I already knew who were fellow sufferers, and the advice from all was the same - stick with it and it will get better.
In the fifth week, I'm now beginning to feel the benefit. I'm getting used to wearing the mask and, whilst I still wake up most nights at some point because my nose has blocked up, or I roll over and squash the mask into my face, I'm sleeping better and starting to feel a real improvement.
Don't despair, read through other people's experiences, ask questions and keep at it. It may take longer for you to get the right combination of machine & mask and to get used to it, but it's got to be better than living with the symptoms.
Paul in Essex