Fluids are very important for colostomates as well. drink your proper amount of water per day. Check with your doctor about laxatives BEFORE using them, and make sure you chew your food thoroughly at meal times.
Those are instructions for ostomates who may be heading for a 'blockage', some early signs of which you indicated. Of course, I'm not a doctor so you may want to check with at least your ostomy nurse to figure it out.
I have experienced blockages so much I almost know when things (feelings) are heading in that direction. I have however for the past three years had it under control (knock on wood), and water plays an important role in that, along with not 'pigging out' at meal times, or eating Chinese vegetables (among other things). Movement can increase motility where output has slowed down.
Hope you feel better soon.