I just joined the National Guard and am leaving for Basic Training in a month. I'm 6'1 and 150, so I'm not overweight, but I do get winded easily. So I started running to get back in to shape. But after a couple minutes, I get tightness in my chest, chest pains, light headedness, and my heart starts hesitating. Like its off a beat. I also developed a rasping cough for a couple hours. Is that just because I'm not used to running? Or is this all a sign of a bigger problem?