When i get up and do any activities such as walking around my head starts throbbing really bad, it has been happening for a week now. whats wrong?

Headache on rising: Pain as described can be from a multitude of causes. Some are more serious than others, so see your healthcare provider to "rule out" more serious reasons. Generally, hormonal shifts in a young female are caused by sudden changes in levels of hormones, but you should consult your provider to be certain.

See a doctor: go and see your doctor this need monitoring and testing and evaluation it could turn to serious the heart does not like to race please see a heart doctor or your PCO