Scared of physical exam preventing my dream job

Hello!! I'm a 19 year old girl about to hopefully join the US Army, which is my dream.

However, I need to pass the physical, which is coming up in a few days. I'm genuinely terrified, mostly because of my slight hearing loss. But also, considering my diet consists of (and practically has ALWAYS consisted of) dino chicken nuggets and cookies, I'm worried I won't pass the blood tests. I've started taking women's Centrum vitamins recently, but is there anything else I can do? I'm so so nervous about this entire thing… this physical has made me practically another person this past week. Then not to mention they’re gonna record my heart rate… ugh.

Any advice on what I can do? What foods I could eat or anything? Maybe some reassurance? I am a loose cannon this week istg. I would REALLY appreciate any feedback. This is my dream job. Thank you!!!

TL;DR—Really scared of my physical due to poor diet and other things. Any practical advice on diet and, I suppose, somehow hearing better is really appreciated. 💖💖