Hey Nas,
Course you will feel scared. I just had a relatively simple but horrible injection\blood test in hospital and was in bits, let alone what you are facing.
But it's good the appt is soon,that way, as someone else said previously, there will be a team working a plan to your best way forward. I don't want to sound glib at something so personal and scary to you, but this is what these medical people do day in and day out. It's their job to do their best for you.
Take some time to work out any questions you have, and hopefully someone to be there with you. Evening you a massive and supportive hug. X