I am a 26-year-old male (175 cm, 52 kg) with progressive diffuse hair loss affecting my entire scalp, including sides and back, along with eyebrow/eyelash thinning and premature graying. I have always been very thin and cannot gain weight despite eating well. I also have fatigue, poor exercise tolerance, high pulse/heart rate, brief dizziness on standing, excessive sweating, allergies, reflux, constipation, occasional bloating, poor sleep, and dry itchy skin. Please evaluate possible nutritional, hormonal, metabolic, gastrointestinal, autoimmune, or sleep-related causes. Would tests like CBC,
ferritin,
B12, folate,
HbA1c,
thyroid panel,
testosterone,
LH,
FSH,
prolactin,
vitamin D,
liver/
kidney tests, and zinc be appropriate?