I have just noticed how much my hip bones are sticking out and I am embarrassed. I never weigh myself. I was last weighed and measured nearly three years ago. My BMI was just about in the healthy range. I have no idea what I weigh now and do not wish to know. However, after looking up the physical symptoms of being underweight, most apply to me. I have cold extremities and suffer from fatigue and night sweats. I am currently wearing size 6 clothes but some are too big. I have eaten too much chocolate lately, to the point that I have developed a burning taste in my mouth when eating chocolate. Any advice on gaining weight?