Hi Debbie,
I am sorry Dan is having such problems so early in his treatment program.

I had major constipation problems as time went on in treatment and it can be pretty severe. I had a lot nausea caused by it as well as other problems. I tried all of the over the counter stuff with poor results. Talk to your doctor as soon as you can. There are prescription drugs and other ways to control this. This is a common side effect and they should be able to manage it.

The obvious dietary things are more fiber in the diet. The not so obvious are avoidance of things like rice and bananas which are binding agents. It can also be exacerbated by not enough fluids. My understanding is that cancer patients must take in 2-3 liters of water (or other equivalent liquids) every day. Certainly you should also discuss these issues with your nutritionist.