Aww @Flabuary, we’ve all been there. Don’t beat yourself up. You haven’t got too much to lose.
Weight is food intake, though exercise helps, like a brisk daily walk. You have to start changing eating habits in 40s. What’s your diet like? Little adjustments can make a huge difference. Do you have sugar in hot drinks? Do you generally eat lots of sugar, (non gluten) carbs and fizzy drinks?
Intermittent fasting works for me. When you feel hungry drink lots of water as it can actually be thirst. Green/herbal tea/black coffee. Cut out sugar. Weigh yourself only once a week (e.g. Sunday) in the morning before you eat and write it down in a notebook. It really helps to hold yourself to account and see the progress each week, even if it’s only 500g.
Do you like salads? It’s so cheap and easy to make different ones every day. Same base of rocket (or whatever leaves you prefer), then finely chopped celery, cucumber, radish, sliced beetroot, pitted olives, gerkins, tomatoes, peppers, herbs (parsley, dill). Then scatter salad topper and different hot ingredients over the top. Mushrooms or prawns pan fried in chilli flakes/garlic, microwaved smoked mackerel. Or smoked salmon and sliced hard boiled egg. And a drizzle of low cal dressing.