..Sam, try not to even think about it atm until the day you actually go/that's soon enough..you have made the appointment now, so you've done all that you can for now..and well done you/feel proud of yourself.....
...sooooooooooooooooooo, try not to let those little head monsters build up in you because they'll only try to grow and become more important...they're your 'enemy' Sam, not the GP...when you see the GP, what is there to fear..?...he/she will either reassure you so you'll feel completely reassured and ok or if there was a problem with your health..?...so you've taken the first step to becoming better/getting it sorted out..(which it will be..)..so nothing to fear at all and everything to be pleased with yourself about../feel a little lighter about the whole thing....