I'm unsure what to think..

Hi I am unsure what to think. My last period was (09)September 29th. 2-3 weeks ago I started to have small lower abdominal aches along with slight nausea, Frequent headaches and bloating, as well low fatigue and sore/tender breast. At first I thought I was pregnant then i just suggested my its my period coming but I never had a fatigue/head aches situation when/starting PMS. It lasted a little over a week and no period yet to come. Then recently I started becoming emotional, just crying over the most ridiculous reason. I couldn't find my other slipper so i just busted out crying.. Kinda silly i know. I have took a pregnancy test on the 27th of (10)October and I resulted with a negative. Then today, the 7th on (11)November I started my period. Severe lower abdominal cramps, where i had to cry myself to sleep so the pain would go away. During my 2 1/2 hours of just crying i vomited a little blood once  then didn't feel as if i needed/wanted to vomit anymore. I haven't had such horrid cramps in a while. I am a healthy person. I am just don't know what to think of this situation.
 Today I feel a bit better. I'm still dealing with this headache, slight lower abdominal ache but i can barely notice it ( until i stand up) over the tight/ preasured feeling. Ever since all this has started I've been feeling strangely calm? My Breast are still sore/tender. As well under my breast I have a pinch of pain sometimes, but i think it may be just from crying, vomiting once, and just being in pain for a few hours.
Could I be Pregnant, or is it just my body messing with me.