Dizziness and light headed on period?

This is my first REAL period in probably 5 years. Mirena removal three weeks ago. So this is my first Off of birth control.  I woke up to go to the bathroom early early this morning and just about passed out. Very lightheaded, ears were ringing, vision went black, and I was shaking uncontrollably. I still feel very weak and lightheaded when I stand up. Does anyone have any recommendations to make this better? I have had a good breakfast and a small cup of coffee but still no change. Thanks in advance