Hello Miss Bowman;
welcome to HealthcareMagic
of 7.2 is very low as normal should be between 12-15 so you need to start on medicines to increase the haemoglobin.Also since you have very heavy periods the haemoglobin will reduce further so please visit your doctor
and get examined and he/she will prescribe
the necessary medicine or injections to control the excess
bleeding as well as increase the blood.