Seriously freaking out

I've got a huge doctor's appointment coming up tomorrow and I couldn't be more nervous. I've gotta have so much checked and I'm also going to talk to them about the anxiety medication. I'm having my thyroid checked, my blood sugar checked, and this spot that came up on my stomache about a year ago checked. When this spot came up, everyone convinced me that it was nothing to be worried about, but now I'm not so sure. The spot just keeps getting bigger and now everyone's got me worried to death that it's skin cancer or something like that. Needless to say, I'm a nervous wreck at this point. I'm also worried that they're going to find something wrong with my thyroid... thyroid conditions run in my family, so there's a pretty decent chance they'll find something wrong, and that makes me nervous. At the same time, a hypoactive thyroid would explain all the weight issues I've been having, and it is treatable, but I just don't want to have to deal with it. I'm incredibly stressed, I'm worn out, and scared. Bleh!