Extremely heavy menstrual (when i shouldn't) i become shaky throughout my body to the point where i can't get up or think straight. causes?

Ans: Well if your period is that heavy you need to see your doctor for blood work to be sure your symptoms are not coming from the heavy menses and thus loss of blood. Do pregnancy test as well

Heavy bleeding : Heavy bleeding can cause anemia which is so severe that your body's ability to carry oxygen to your muscles and brain is compromised. See a doctor immediately. If necessary, call an ambulance now. Be safe and be well.