I have always weighed in the 70’s since I was younger. Recently last year (2016) I was finally 80lbs; also I am 25 years old. So far healthy, no heart lungs or kidney issues. Recently been having anxiety attacks, just this past may I was 87.2lbs and since then till now, I am back in the 70’s. My potassium was low once and so was my iron, I’m confident that it’s not normal. My d-dimer was elevated but no clots. I eat when I’m hungry then full right after. What else can I do?