I really cant help you as I wish I could, but it seems to me that "Colonoscopy went well, (I guess) was told it was treatable and cat scan of my other organs came back clear." is really good news!
Also the fact that you are relatively young (as far as cancer goes anyway) & otherwise healthy- is also really good news!
I cant imagine what you are going through at this moment, but the 2 facts above will certainly influence the outcome of your diagnosis & the other thing that is going to help you is a positive state of mind.
I hope you receive many replies to your post from people that have been through this cancer & can give you some practical advice & knowledge.
Meanwhile know that you are in my thoughts & ready to listen at any time- if this will help you!