My Digestive System Has Been Through A Lot, Ranging From

My digestive system has been through a lot, ranging from gastric bypass to emergency bowel resection and internal hernia. Up till now I have had absolutely no problem pooping, went everyday usually twice a day. Now all of a sudden I'm constipated, which causes stomach bloat and pain. I've tried changing my diet, enemas, stool softeners,laxatives.. With very little relief. This last time I tried to poop, it came out looking like someone dumped cooked (brown) ground hamburger meat.. It floats. Then I had thick looking mucus when I tried again. What is a possible cause and solution?