Depends on the cause
If the anemia
is caused by iron
deficiency- then perhaps you can increase uptake of food that rich in iron such as spinach, beets, liver etc.
You can also buy otc iron supplement for iron deficiency. You can give yourself vit B12 injection if this is a case of vit B12 deficiency. However, until you know what the cause of anemia , it will be difficult to treat anemia. Please see your doctor.