I have the same problem on and off. Keep up with the water drinking. Take 2 senokot every night until you go. Fibreclear just bulks it up when all systems finally go. Fibresure has far too many calories and is not recommended as far as I know.
Suppositories/Enema...mmmm. Pharmacist suggested that last wek, I bought one and never used it.
If you get up to 3 days with nothing, try adding dulcolax.
Good luck