Hi, don´t worry about security in Erbil, everything is ok.
My husband and I are also mexicans... and live in Erbil, my husband has been living here the last 4 months while I just arrived and haven´t had any concern regarding security.
We are still settling down, though, but you will feel more relax if your read more about it in the blog where many expats have talked about the same subject you are asking for.
¡Qué bueno que hay un mexicano más en Erbil!