If your hair is severely damaged, it will not be possible to get a color that requires pre-lightening, such as pink, without risking severe damage and breakage.
It sounds like you have over-toned. Stop dying your hair and it should fade back to a brighter hue. You could also try washing your hair with a clarifying shampoo...
You can wash your hair every two days, but aiming for washing it twice a week would be better. Washing it too often will strip your hair if its natural...
