Your CBC shows a low haemoglobin with microcytosis, and your
ferritin of 7.2 confirms iron-deficiency anaemia. That fits with the hair shedding you're seeing now.
Next Steps
Please go back to your prescribing doctor with this update, since only they can decide if your current dose needs adjusting.
Health Tips
Being underweight can affect how you respond to iron correction, so your diet needs attention alongside the tablets.