history: I have a health check up tomorrow, but I am a bit nervous to go. It's been a while. I've got a health check coming up tomorrow_comma_ but I am a bit nervous about it. I never liked those either.  Do you have any health problems that would make you dread it?  
current: Not really (I think). Just the whole process is something that makes me nervous, perhaps foolishly.
next: 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!