Feels Like I'm Dying

Occasionally right before my period, I get these really bad headaches and feel like I'm going to faint, but never to the point where I thought it was anything serious. Recently though (the past three months) I have been feeling faint constantly. Not every day, but at least three times a week. It always starts the same; a raging headache followed by my heart feeling like it's going to beat out of my chest and then my legs feel like they're going to buckle underneath me and I'm going to fall over. My mind is always with it though and I'm able to maintain conversations and be aware of whatever situation I'm in. I had a check up recently and everything was fine, but this is really scaring me. The past week has been especially bad and I've resorted to staying in bed as much as possible and canceling plans with friends because I feel so weak. What is happening to me?

See your doctor again ASAP, or go to the Emergancy Room or Urgent Care if this happens again.