Mark why do you think your family doctor says not to worry? A hypochondriac would go through a range of doctors before he found one he trusted, so why is yours dismissing this? There is a reason your doctor is not concerned with a 3 week delay to see the ENT.

We're not doctors here, only patients and carers. But I'll give you two bits of advice for free, take them as you like.

A big part of facing a serious medical problem, not just cancer, is the mental state you face it with. Look at the cancer path some of the people face here, and say "I don't know how they do it." Well they take it a step at a time, because that's all you can do. Your next step is the ENT in 3 weeks. That's it. You don't worry about anything past the next test, the next treatment, because if you worried about it all at once it would overwhelm you. So take it one step at a time, as calmly as you can.

Don't look at the internet for survival rates. When you do that you are faced with a myriad of unrelated conditions, statistics, trials, studies etc. What you are really asking the internet is "will this kill me" and of course the internet doesn't know, so you're left with an answer of "maybe". Get off the internet, otherwise you'll think every headache is a brain tumour.