Hi I am 26yrs old & I am sexually active with my partner. I live in remote country and have a poor health system. I have had irregurlar periods before but now I have not had my period since OCT-NOV last yr2010. I have had a blood test & ruled out pregnancy.I have gained weight rapidly over the last yr, I eat well I don't do much excerise I like a drink can someone explain why this might be happening to me?
I fill like I have period pain present but I am also taking a strong antibiotics for a ear infection causing me diarrhea...

Unfortunately there's no way of diagnosing you over the internet. If there's anyway at all that you can get to a doctor (maybe whoever diagnosed you with the ear infection?) that would really be best.

You mentioned you gained weight. Are you overweight? Have you been experiencing any stress? Have you been tested for stds?