Rather than a blocked bile it is most probably a variation in your digestion either because the bacteria has changed slightly or because some congestion has moved down from higher up in the biliary system. More of a restriction than a blockaged. Old bile could cause the bacteria in the intestines to change temporarily. Sometimes after removing so many stones one has to wait a few weeks for things to settle down. If you don't feel any different then its not a problem and more than likely will return to a familiar colour soon.
If you are up to it then you could decide to follow a programme of flushes to see if you can remove even more congestion. Once every two to four weeks is fine.
The "fine" grade of Epsom Salts is very common in the UK where I live and I also know that people are able to buy it in drug stores in the USA. It comes in 500 Gram tubs usually.