When I first did the MC, I didn't know that it is not recommended unless you "go" once daily. Heck, at the time I didn't know people were supposed to go that often! Anyway, if you're that constipated, the tea will give you some trouble. You can still do Master-Cleanse but it can be difficult.
It sounds like you need to get on the Bowel Cleanse Forum as suggested and look up some stuff. Enimas are an option but there are other options that you can try out on an off-work day so you won't be running to the bathroom uncontrollably. I've done Oxypowder when I'm in your situation. Others do the Psyllium and Bentodite (SP?).
After you find immediate relief, you may want to consider parasite cleansing (I like humaworm) and liver flushing, as the liver helps digestion flow. On the curezone home page, there is a link toward the top-middle for "Cleansing" and it will give recommended order of protocols and useful information. Good luck!