I'm so confused

I had my period on April 28th of this year . But it only lasted 3 days and it was gone . My last week of school which was from the 5th of June to the 9th , I had real bad cramping in my pelvic area. A week later I got down with bad stomach cramps and heartburn which then I fell ill and got weak. The last 2 days I've puked but it was barely even a pint a day . Now recovery from my sickness , my stomach seems quite closeted still and still gives pain if I lay on it and I'm still dealing with headaches , weakness , dizziness.