@NeonRaven8919,
First of all, let me assure you that we all have head hunger. None of us got to a weight where we required weight loss surgery without overeating, and we all have our own demons. You are among others like yourself. It sucks, but it's not unbeatable.
Here's what I have to say. I was in intensive outpatient eating disorders therapy for a few months, because I recognize that I am a compulsive overeater. That did nothing for the head hunger and portion control problems. For me, gastric bypass was the only solution because I need that brake on my overeating. And now, I have not had any sweets or high-sugar items since surgery because I know I could have dumping syndrome afterward, and nobody wants that. So that's another brake. For me, it's much easier to not eat something than to try to moderate.
The reason for all of that is because I have a food addiction. I know this about myself because I also happen to be a recovering alcoholic, and the cravings are exactly the same. I did not get sober by myself. White-knuckling does not work for addiction. The compulsions are simply too strong. I could not have gotten sober by myself. And there was no reason to, because there is free help out there. Did I want to quit entirely? NO. But I couldn't go on like I was. And now I'm 32 years sober, after starting in a position where I couldn't go 24 hours without drinking.
Why am I saying all this? Because your story sounds like mine. "Mindful eating" to control compulsion makes about as much sense as "mindful drinking" to control alcoholism (which is to say, none). So you may want to approach this problem like an addiction. I am not saying you are a food addict, only you can know whether that's true for you. What I'm saying is that you do not have to do this alone, and there's free help out there. @BigSue told you about some, and you will find TONS of support groups online in addition to the one she recommended. Take advantage of this free help, because white-knuckling is horrible and mostly doesn't work. Why? Because it's not about willpower. You did all the stuff to get your surgery, so we know you have willpower. If that worked against the kind of compulsion you're describing, it wouldn't be a problem. It doesn't. What does work is support groups. That's because they're full of people like us, who have to fight to change our relationship to food.
If you do happen to think you might be a food addict, check out Overeaters Anonymous. There are groups everywhere and it's free. You don't have to commit to anything and there's no test or anything to attend. You can just listen or ask questions or whatever. I absolutely guarantee that if you told your story about the food at work to an OA meeting, every single head would nod. Everyone will know exactly what you're talking about because they've been there.
Please don't give up on yourself, you're on a journey. People slip up. We get to pick ourselves up and dust ourselves off, and keep on going forward. You did a brilliant, extremely courageous thing in sharing your challenge here, and see how much support and help you got? You can do this. You CAN do this. We all need a little help from our friends.