Hi,
As per your symptoms and findings, you seem to have 
Iron deficiency anemia as the same presents with fatigue and has small RBCs. The cause of the same seems to be 
chronic blood loss due to may be excessive bleeding during your cycles and so Lysteda may be helpful with same. So you must take the same in view of excess bleeding.
For further workup we need following
1. Peripheral blood smear
2. Serum iron profile (Fasting)
3. Serum 
vitamin B12 and 
folic acid levels
4. Stool R / M, ova / cyst
5. USG Whole abdomen
For treatment we may consider:
1. Tab Bandyplus single dose
2. Tab 
Multivitamin (A to Z) for a week
We may review with investigations
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Santosh K. Pandey, General & Family Physician