hi I m 19, 5 foot 3 and 195 pounds, I lost 15 pounds this summer but I haven t been able to lose any since I started school, but I haven t gained any either. I recently started to feel tired all the time. I was doing all I could not to fall asleep in class. I get anwhere from 8 to 9 hours of asleep every night. A few days ago I started to get pain and tightness in my chest along with feeling my heart beat in my chest and felt like I couldn t take a deep breath. Things that I could do a few weeks ago without a problem are now making me winded and extremely hot, though I m not sweating. I went to the doctors office today and she brushed it off of her shoulder as if nothing was wrong saying that this is normal for people me age. I disagree with her I have never felt like this before. I also have horizontal ridges in my nails, they used to be very thick and now the tend to break all the time.