I had mine out when I was in Yr 10 at school (so like 16yrs ago! )

I had pain in my belly that was excruciating, but I put up with it as at the time I also had glandular fever so I thought it was to do with that. In the morning I told my mum and she took me straight to our GP. He then called up a surgeon who told me to go straight over. He felt my belly and told my parents to go home, pack a bag for me and take me to the hospital. This was at 12pm. That evening I was operated on and my appendix were close to bursting when they were removed.
I was in hospital for 2 days and should have stayed in for 2 more days but I needed to sit for my half yearly yr 10 exams. So on the 3rd day I was at school doing exams. Because mine was such an urgent thing I have an 'old school' appendix scar, so they didn't do it via keyhole like some people get.

Wishing you all the best. I hope you get to have yours removed soon