Heavy bleeding is not normal, it may cause Anemia and weakness as you are observing.
Next Steps
It's important to find out the underlying cause of heavy bleeding for better help.
Health Tips
For prompt response in controlling bleeding, you can take Homeopathic Medicine - Ficus Indica Q 20 Drops twice daily in some water for 3 days.
You can also consult me in person online through Practo Consult for more help and permanent solution.