Nervous about work and new sickness.

It's been going on for some time now: I'm agitated about my first days of work. It's like going to college, only that, instead of being more excited than anxious, I'm actually more anxious than excited. What if I screw up? What if I fail to carry out a simple instruction? What if I don't get along with the other trainees? I know I'm being unnecessarily and unhealthily worried, but I can't help myself. This is all new to me.

Kinda like this strange growth on my right arm. I think it's a cockroach bite, but I'm not sure. At first there was a hard, tiny mound-- a reddish swelling. Touching it revealed the fact that it was sensitive. A little poking in the immediate area would immediately bring me to my knees in pain (okay, it's not that bad). A few days ago, though, the tip of the reddish swelling turned into a blackish/purplish swelling. And it seems to be expanding throughout the tiny mound. Now I begin to worry. I have had cockroach bites before, but I have never experienced this blackening. It reminds me, quite terrifyingly, of gangrene infections. Ugh. I am getting sick a few days before work. First the sty, and now that's over, this.

Whatever am I to do?