Could i have colon cancer?

No worries. I have been constipated for 35 years. How that for a record?! All you need is 10 dried Apricots, or 1 Mug of Hot Prune Juice, or 1 Warm Pear. And if worse comes to worse 2 Prune Wafers. They can be ordered off the internet. I have not seen them in stores unfortunately. I too have nausea and fatigue...it's amazing what constipation will do. You should be worried that you have constipation, but not colon cancer. Increase your fiber, and your water, and the above mentioned foods, or prune wafers, you will start to feel better.