I'm 13 and for the past few months my lips have been turning blue constantly, even when I'm not cold. Also, I am constantly freezing. When I return from school, I sit in front of the fireplace or the heater ALL DAY until I go to the gym, and then I have a fluffy blanket, fluffy pajamas, and a hot water bottle in bed. I've been losing weight recently but I don't know if that has anything to do with it. I also get dizzy often and fall asleep in the bath. I seem to keep forgetting little things as well. For example, this morning, I completely forgot about my school bag and had to call my mum to drop it off. Etc, etc. Should I be concerned?