I am 21 years old, and my periods have always been regular. I have not had my period in over 2 months now, I have taken 3 urine tests and all negative results. I am tired all the time, have gained an excessive amount of weight, my breasts are tender, discharge, anything I eat I get sick, and I have been having alot of cramps and my mood swings are horrible. I went to the doctor where they got another negative urine test, and sent me for an ultra sound to check for cysts. The ultra sound came back negative. I would really love to figure out whats going on and have alot of these symptoms go away. anyone have any ideas?