We all seem to fall into that trap so you're not alone. It must be a mental thing and I believe until we start believing in ourselves, truly believing, nothing will be gained from it.
I trap myself quite a bit, then I punish myself by eating way low than I should.
Back and forth and back and forth. It will stop at some point but I don't have an answer.
Maybe you need to find strength in the mirror - look how far you've already come! 10 lbs is a heck of a lot of weight to lose. Getting older makes losing tougher, believe me. I find myself praying for a downpour of rain so I don't have to go for my 2.5 miles walk each day. But, it doesn't rain, so off I go.
So listen, get off your butt and get going!
It's always the rough road we find unpassable, yet we DO find our strength in others.
You WILL succeed!