Hello, I am 18 years old, and I am feeling many symptoms which I am unable to figure out why.I have head aches, back pain, breast pain, nausea,rapid mood changes, acne and my asthma has been servilely bad lately. I got my period last month but my symptoms sounded like pregnancy so i took a pregnancy test anyway. It came up Negative. Now, I am still experiencing the same symptoms but my period has yet to come, so i took another Pregnancy test and still negative. I do not know what is wrong with me. Please help.