I'm a 23 year old mother of an almost 3 year old. I've always had very regular periods. About a year ago I had a row of little knots under my skin pop up on the back of my neck that hasn't went away. Since then I've had two more around my ear. I'm fatigued missed my period took two at home pregnacy tests,negative. One month late. Used the pull out method. Racing heart,trouble sleeping,hoorible sweating and night sweats. What's wrong with me.