Hi. I am 24, female 105lbs and active. I started a new gym subscription a month ago to build muscle to add to my weight. For the past week I have been feeling so much colder than usual, a bit headachey, sleeping a lot, lightheaded and getting palpitations and flutters in my chest. This morning I have a deep pain in my left calf which is uncomfortable. I have no energy. I have been religiously taking a multivitamin and probiotics so i dont think its anaemia.