
I'm there myself. I recently regained alot of weight that I had lost & trying to start over once again...
I think not understanding why you could go so off course is really difficult. I was doing so good and then boom just fell apart. I think honestly it isn't ever just one big thing that happens but alot of little things that add up. So its hard to notice that you are slipping until you have already hit rock bottom.
I think controlling those little slipups and not letting them carry us into worse mistakes is the goal.
You can do it. Posting and journaling really help me alot.