Don't be daft Ethel, if your GP has said you are to make an appointment, then you must make an appointment. If your receptionist is a dragon who doesn't believe you when you say your GP told you to, then sit down and write a letter to your GP, asking him if HE would mind making the appointment, since the receptionist seems unable to.
You are pretty vocal at telling us all about the problem, why not take it to where it belongs - the surgery?
And why not ask your consultant or the lovely nurses at the hospital about your fears? They see people EVERY DAY who are in exactly the same position you are - waiting for treatment and worried stiff. They will spend time with you explaining what will happen, what just MAY happen, and what will NOT happen. They know what the procedure is at the hospital you are attending - which no-one here does, they can only tell you about THEIR experiences.
Now for home truth - Stop suspecting everyone's motives. The doctors will NOT tell you lies, any more than we would - than we already have, several times over. They would be in trouble if they told you lies. ASK and you will get an answer.
Sit down now and write a list of all the things you want to know, and what fears you have. Then lift the phone and ring the contact number you have been given for a cancer nurse who has been assigned to you, to answer just these questions and support you. No, she is not a vulture, there to watch you die, she is an expert in everything that is going on and will help. I know that you will have been given that contact number, because I was, and so was my husband. Other people who have had cancer (and most recovered!) had a named contact too.
And another suggestion - you have had a vast number of posts from good kind people posting helpful and loving replies on here. I do hope that you have thanked them for their support.