Shells,
I had the same problem with chemo, pain meds, and boost actually causes the problem ,too, I was recently told.
Here's the formula my friend gave me that really helped:
You want to take the pills with the food you are trying to soften up and move out:
2 fibercon or citrucel tablets with breakfast, and a glass of water
2 fibercon or citrucel tablets with dinner, and a glass of water
Stool softener at night if no movement for 1 day
(not laxative or stimulant laxative)
This worked really well for me, I was having bleeding and pain and lots of tears for the 10 days after chemo until I started with the citrucel.
Hope this helps!
-Jen