I am feeling nauseas and have no appetite. i also have had gas pains in my back ond chest. i am not able to have a bowel movement for several days.

Constipation: Sounds like you're very constipated. In the long term, adding more fiber to your diet and drinking more water are essential to prevent this from happening. For now, try taking an over the counter stool softener like Miralax (polyethylene glycol). You can take this twice a day until you are moving your bowels, then taper it back to once daily or once every other day to keep regular.