I'm in the military and ended up in Germany about a year and a half ago. Running's always been my thing and I've never had issues with it before. But then last August, out of nowhere, I started feeling this sharp chest pain when I was out on a run. At first, it didn't show up until around three miles in, but now I can't even manage a mile without feeling it. I got an inhaler and it worked at the beginning, but now it seems useless. I'm just 22, and I'm not sure what's going on. Any ideas on what this could be or what I should do next?