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 °µÍø½ûÇøs have talked about the same subject you are asking for.
¡Qué bueno que hay un mexicano más en Erbil!