Before you take the fibre89, make sure you have been for a number 2 and cleared your system. Otherwise the fibre89 makes it a lot worse, I know from very painfully experience.
I got very badly constipated and have to go to my doctor, I don't want to sound disgusting but I couldn't stop bleeding, after my giant rabbit pallets came out. To get the rest out the nurse had to do that!!! As I couldn't stop shaking in pain. They put me on a high fibre complex carb diet for a week & I haven't had a problem, now I am back to SSing.
Obviously you don't want to do that, as I put on a lot of weight in that week. I would clear your system with senakot (if that works for you) and then take the fibre89 and make sure you are drinking enough water (I think that's why I got constipated in the first place). Hot drinks help you go for a number 2, exercise also helps, a hot bath is good with a little baby oil in the water (I don't mean to sound rude, but in the bath from the number 2 hole you can try to suck up some water, which will help soften whats waiting to come out).
I really feel for you xxxxxxxx