I have anemia from 2 weeks. Hemoglobin HGB is 6.9 g/dl. I'm taking some vitamines (C, B1, B6, B12) but I don't want to be a fat lady. What can I do or take?

Go to your doctor. A hemoglobin of 6.9 is pretty low. Taking vitamins won't really make a difference. There are many, many causes of anemia and you likely need to have further work up to make the correct diagnosis. After that the proper treatment can be initiated.