hello, I am 22 yrs old, n am nt gettting my periods frm last 5 months n its suddenly stoped.. i have problems of delaying periods bt nt for so much tym, i have done all test , results r negative, only on thyroid test it cms lilt more, doct prescribed me thyroid tablets, but i am very much worried nt to get periods for so long tym. please suggest me medicines and how to take doses? thank you.