Sports induces amenorrhea

[Anelia]

There are many active women in this forum and I wonder if there are others like me who are among the 20% of the active women who miss their period due to exercise. I am 33 years old and I have one child. I have my period missing since I started exercising vigorously. Sometimes I get it but it happens 1 or 2 times a year. I also had a very long amenorrhea when I was breastfeeding my son. My period didn't show up until my son was 2 (I breastfed him until he was 3). Now I don't remember the last time I had my period but I think it's over a year. I don't miss it. It is something that I hated as a teen because of the pain and suffering I've been through. After the birth the pain dissapeared and the quantity was less. But now it's none. I went to see a doctor about 2 years ago and he prescribed me contraceptives. I really disliked them because they made me sensitive, I cried a lot and was moody all the time. I hated that and I stopped them. Since then, I don't have my period and I enjoy this but also I am worried a little bit.
I am not undeweight and I eat a lot: carbs, protein, fat...everything. I just exercise too much because it makes me happy and I race.