Thanks for sharing your concern.Anaemia
due to iron deficiency
, shows that your body is lacking severely,as far as iron storage is concerned.
The injections you are taking presently will replenish, the storage again but definitely. It will take time probably around three months.
Overdosage is not recommended as it can be very harmful.
you can,presently supplement your diet with iron rich components like spinach,and other green leafy vegetables and fruits like chikoo,apple etc.This will help you largely.
Hope it helps.
wish you good health.