I have to agree with Judynyc. Desperate times come for desperate measures. The most gentle thing for emergency situations like this one are glycerin suppositories. Then if that doesn't work, you could try either a stimulant laxative, enema, or a bottle magnesium citrate. I hear the magnesium citrate is pretty gross to drink, but whatever works.

As a precautionary measure, you should really start taking daily fiber supplements like Metamucil or Miralax (gentle non-stimulant). If you're not eating enough green vegetables, you could also try eating more of those.

I have had a problem like this before. It caused me to be sick to my stomach, my abdominal muscles felt like they were being cut into, and I was extremely moody... understandably.

I really hope you get this situation resolved soon.