Cyclical Tendancies

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I was doing so well for a while there. Lost 30 lbs, surge of confidence. Somewhere along the way I've fallen and it took eating an entire pizza (1000+ calories) for me to realize my own self-destruction. What happened? How can I get back to that point where I was loving exercise and more importantly myself? No matter my good intentions, I always seem to fall after about a month or so, and almost unconsciously. It's like I'm not aware of what I'm eating anymore, I'm just mindlessly zoned out.

Really feeling down today - hoping to find some motivation, tips, advice or a kind soul.