I feel for you. Tetley used to have really runny poos when he was little too - sometimes black and sometimes with lots of mucus. Took months for everything to get settled. I found that chewing on bully sticks and some chewie toys would give him the runs so I kept those away from him until he was older. Now he can eat anything and has firm poos with only the occasional bout of the runs.
Hope your little guy feels better soon. It's so hard watching them go through such distress and looking to you to make them all better.
