As you don't seem to have access to a sleep clinic, would it be helpful to let you know what my sleep clinic recommended? If not, (and you may be fed up to the back teeth with people who don't know the full situation giving "helpful" advice), feel free to completely ignore.
Between about 7 and 12 months my ds was waking up a couple of times during the night and screaming for approximately 2 hours in total. I know your situation is different, but it might be worth a go.
The sleep clinic suggested a really modified kind of CC. They suggested that I should abandon the model of CC I'd been trying which was going in every 2, then 4, then 6 mins (or 5, then 10, then 15 mins, can't remember exactly which). Instead, they said to go in every minute while he was crying. And if he was desparate, to go in every 30 or 20 seconds if necessary. When I went in, I should lie him down if he was standing up. If he was already lying down, then I should just pat him very quickly on the back and say something like "It's time for sleep" and then make a quick exit.
The first night was pretty terrible. I think he cried for about 3 1/2 hours in total, but after that he got a lot better very quickly. I honestly felt that doing it this way, he was bloody cross with me, but he did not feel abandoned and was not hysterial in the way he had been when I had tried (and failed completely) with the more traditional CC approach.
Unfortunately, the CC did not solve the problem in the short term because then he got some more teeth and he was back screaming for hours on end. Again, the sleep clinic was very sensible and said if there is an obvious problem (e.g. sickness) don't try and make them sleep well. Just give them a cuddle. For me, just hearing someone say this, even though it's completely obvious, was a great relief. I was so sleep deprived, I think I had lost the ability to make good judgements about what to do for the best. For several weeks, the only way I could get him to sleep was by dousing him with neurofen. But when that period came to an end, I did the gentle CC again, and very quickly he started to sleep well.
I would second what others are saying about checking out whether there is a medical reason for him pooing so much. My ds's teeth problems demonstrated to me that sleep training just doesn't work if there is an underlying physical problem.
Best of luck.