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Hi, I'm a licensed veterinarian and I'll be happy to help you.
I hate to be the bearer of unpleasant news, but this sounds like a situation that needs re-evaluation by a veterinarian right away. I suspect that there's a complete obstruction from the rope / strings you mentioned, and colace is not going to help with this, nor will any other oral laxative or similar product.
The discomfort, lethargy, lack of appetite, and abdominal muscle spasms, are very worrisome signs, and I fear that this situation may end in a very unhappy result if you do not seek a re-evaluation (and likely surgery) as soon as possible.
Yes, that is my suspicion, based on what you've described. It is possible that it WAS moving, while receiving IV fluids and maintaining optimum hydration. Now, with that discontinued, it is likely that we've taken a steep backwards slide in that process.
I do not at all feel comfortable suggesting that you wait on this until Monday. You've described a serious enough situation so far that I would probably not want to wait beyond tomorrow morning, at the latest.
I'm sorry I did not receive your last reply early this morning. I would suggest trying to give him only tiny amounts of water or pedialyte or gatorade, 1-2 teaspoons per hour at most, as a "trickle" feeding of sorts, encouraging him to drink large amounts is sadly going to just make him vomit more, as you have already found out.