I Was Having A Lot Of Bleeding During/after Sex And

I was having a lot of bleeding during/after sex and went to the doctor I'm only 19 she told me I had uterus erosion or something like that and she put something on it for it to heal do you know what that treatment is she said if that doesn't work
I will
Need to come back again and after that I will need to get it freezed? Will this effect me having children at all and how long after the treatment can you have sex?