I hit my all time highest weight recently too, and it is such a depressing feeling. I re-weighed myself a couple of times on the scale because I couldn't believe it. It's easy to feel despair that it's so far gone, why not just eat a cookie, because who cares. What's helped me is to enlist my sister and some women friends to check in with. It's not formal, just checking in a couple times a week about how it's going. I also have had to think about this change as a new chapter and new lifestyle, not a diet fix that is eventually going to allow me to go back to eating things that are unhealthy for me. I had to decide that those days are over. Kind of like breaking up with someone, or quitting a job, actually.
Something that's been helpful for me is to think a lot about when I was the weight I now want to be at. I was single and dancing (and crying) a lot (in my early 30's), and I I think having those expressive outlets was helpful, and also being single I didn't have a tall, skinny man in the house who loves potato chips and cheddar cheese. Because my life is different now, I've had to flip a mental switch inside myself in order to commit to a new lifestyle: I have had to decide on some deep level that I need a new chapter and nobody is going to do that for me except me, and I can't let anybody else's potato chip addiction stop me, either
Food is such an easy and controllable way to get dopamine, serotonin, and other feel-good neurotransmitters going, I think it's also important to make those chemicals happen in other ways. I am taking a stained glass class, and that makes me happy. I also try to laugh a lot with my husband, which makes me happy.
Part of my seeing this as a new lifestyle helps me not be so impatient (I tend to be an impatient person). Like it might take 6 months or a year to lose the weight, but in a way that doesn't matter because this new lifestyle is just going to be the way I live. Seeing it that way doesn't set me up for feeling like a failure when the pounds don't drop off really fast, which is when i would normally give up and sabotage myself.
I wish you the best!