Itchy Eyes Anorexia I'm A Week Late, Pregnancy Test Was Negative, Any Idea What's Wrong? I Feel Sick Flu Like Symptoms?

I'm a week late, pregnancy test was negative, any idea what's wrong? I feel sick flu like symptoms? - itchy eyes anorexia

I once had sex since my last time was a month earlier. I thought I might be pregnant, because my time is always every 21 days like clockwork. Should be on my period now, I have come to over a week too late. I took a pregnancy test today and came up "not pregnant". I have no symptoms of pregnancy and I am glad that I am not pregnant, I have not the time of my life, a baby, and the person that I did not sleep with in my life.

I think I now have a cold, I'm sick, I do not know whether to do so with the absence of menstruation? itchy eyes, sneezing, nasal Snuffy (I took some Benadryl and drank, knowing the air) when you anorexic your time can be delayed or lost, I suffered from anorexia 3 yesRS, and later, yet never missed a period, maybe a few days, but never missed a cycle, the more I gained 30 pounds, but I do not speak, because I want to try to take every possible opportunity (I'm 5 foot 8 and weigh 110 pounds)

What are the causes of the delay period? Please only serious replies only. Bless you very much for your help.