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.
Hi, Fatigue (feeling like you are tired without doing activities that would normally make you tired) can be a symptom of many health disorders.  Hypothyroidism or hyperthyroidism can both cause fatigue. This seems to be what you are most concerned about.  Your doctor may have brushed this possibility off because of your young age. However, thyroid disorders are more common in women than men and can occur at your age. I would ask your doctor to check a TSH and Free T4.  Your doctor may also be attributing your symptoms to anxiety (the chest tightness and need to try a breath deeply). Other causes should be ruled out first before attributing your symptoms to anxiety. Hope I have answered your question. Let me know if I can assist you further. 