hotwheels, lots of folks jumping all over you right now. I am not gonna call you a troll and take your written word about who you are. Couple of things...
You need to find a cardiologist ASAP that is going to treat you for the long haul. This is the person who will run all the necessary tests an provide the info needed for DoDMERB going forward. Going to ER for this condition isn't going to get you what you need in the long run. The ERs only concern is to stabalize you, so unless you have direct symptoms or episode the ER isn't going to do much but refer to see a cardiologist. You need to also sit down and have a long chat with your cadre about what you have experienced, timelines, etc. This is what will matter in regards to verifying your paperwork, etc. Also, don't put the cart before the horse. You have only had a NP look at you. In the end it could be something that is easily treated or it could be something that is bad. You don't know that yet. Let the process play out like it needs to. The key parts are to be open and honest with you doctor and your cadre. But you need to book an appointment with a cardiologist immediately, do not pass go, do not collect $200. If you do experience these symptoms again, then I would I would go to the ER immediately. I have seen folks pop up with heart issues around your age, its not completely unheard of. You hear about it alot in athletics.
I think alot of folks are jumping all over you because of some of the other posts. If you remain in ROTC and go onto the USAF realize that this is nothing compared to being a new Lt. You will get flamed on alot. I was a Marine Corps company grade officer, trust me, I know. But, you learn and get better. Also, with all the extra stuff and your "enthusiasm" for things like uniform, swords, etc while a sophomore in ROTC it makes you look like what we would call a "gear whore" in the Marine Corps (I am not calling you one, its a general term). I get you like ROTC and stuff, but focus on the learning and not all the "cool stuff" it makes you look like you're GI Joe, instead of a future officer in training. You show up in ROTC or even as a JO with extra stuff that no one else has, it will make you stand out in a bad way. Its fine to be proud of your ribbons and stuff. We won't even get into the fact that they hand a ribbon for a club! I mean compared to the Marine Corps the USAF hands our ribbons like candy, but one for joining a club? Really? But that is a different discussion.
Seriously take this one step at a time. First and foremost is your health. You need to see a specialist that you can see through this entire diagnosis and care as you navigate getting healthy and then what happens with ROTC.