What's going on?

Alright, so I know something is wrong with me, and i've been to the ER a few nights ago and they found nothing wrong.
Here are my symptoms:
-Missed Period (well, its now over 2wks late)
-EXTREME CRAMPS in my pelvic area, lower back, and lower tummy
It's a burning type of feeling. When it happens its sharp and abrupt.
-headache, nausea
- Extremely tender breasts. very tender! Hurts like hell.
- i just feel like crap, very tired.

-Anyhow, in the ER they did a Cat scan of my stomach (Kidneys), and they did bloodwork and didn't find anything
They also did a pap, and again, negative.
However, he did not do a pelvic exam and I didn't ask. (i wish I would have)

They gave me pain medication, (blah), which I don't even take because how can I function in my busy lifestyle drugged up?

Anyhow, have any of you ever had these symptoms? or cared for anyone who has had these symptoms.

thanks for your advice