I Have Had Some Pretty Intense Cramping And Bloating In

I have had some pretty intense cramping and bloating in my lower (and sometimes central) abdomen. I can go very little during a bowel movement, and I can't seem to pass gas. I'm shaky and fatigued, and my heart thumps fairly quickly off and on. I've had a complete hysterectomy and had a colon resection about 12 years ago. Mo