Hi Chris; Dealing with side effects can be as challenging as the treatments at times. The constipation solution I was given was a daily tablet which combined Senokot (mild lax) and Colace...the stool softening component is vital because our fluid intake tends to be decreased.
Keep exploring what foods you can tolerate...plain yogourt was a life saver for me, also good for the natural flora in your innards. I lost my sweet taste and many things took on a strange taste for a while..even the ensure, it tasted like it was flavoured with iodine, ugh.
Good luck to you, and please persist, your body will thank you later.
Fran