This is exactly what ended my 10 year remission. Stopping all my meds. Although for me it was a new GI that told me to do so. I was in remission with just 5ASAs/Colazal during all that time too. And had been using the enemas as well.
Try not to kick yourself over and over for what is in the past though. There is nothing you can do about it now. Just focus on trying to get yourself better and back into remission. You could still get there, it just might take a little different routine this time around.