system
apprehensive: I have a health check up tomorrow, but I am a bit nervous to go. It's been a while.
human
I've got a health check coming up tomorrow, but I am a bit nervous about it.
human
I never liked those either.  Do you have any health problems that would make you dread it?  
human
Not really (I think). Just the whole process is something that makes me nervous, perhaps foolishly.
human
Don't sweat it.  You'll do great.  Its never a fun process but that's so good you're keeping up with your health!