You need to break the cycle. Don't think about losing weight, but give yourself the goal of not eating crap for 7 days . Clean your cupboard. Take bin bags and put every snack, ultra processed food, open or unopened in the bin bags. Think of it in the same way an alcoholic would remove all the booze in the house.
Understand that you have no fault in this. IT is the environment, the messaging you see everywhere at bus stops or television that eating a Magnum will bring you pleasure and peace. You have been manipulated, made an addict of foods engineered to activate pleasure brain circuits.
You need to be be mad that junk food is thrown at your face anywhere you go from the pharmacy to the newsagent.
You also need to understand how gut and brain work. By eating certain food, you develop certain bacteria that scream at your brain to buy and eat more of that food. Starve them. Because they are also the cause for your low mood.
For 7 days. You can do 7 days . In these 7 days, you are going to claim your life back. You will eat a new vegetable every day. And a fruit every afternoon. You will not eat in front of the telly.
I am so sorry you are stuck in this loop of sadness-food-more sadness-more food. Realise that you are not eating food, but food-like edible substances. Food is a punnet of strawberries. Slices of sweet melon. A caprese salad with quality extra virgin olive oil. A nice steak and a butter lettuce with some fresh parsley. I know it might sound like madness , but for 7 days, treat yourself to real food. Nothing in a packet, nothing in a jar.
Buy a fancy tea, and prepare yourself a nice cup. Identify your triggers. Is it the television, social media, walking home. It is habit not hunger. In 7 days you can break those.
Every time your hand reaches for a packet on a supermarket shelf, you are giving someone a fat bonus. And getting fat, unhappy and unhealthy in the process.
Clean your cupboards now, no matter how late it is. And come back on this thread for 7 days. The onus is on you. It is hard and unfair, but it is the only way.
You can totally do 7 days.