I'm not doing it currently but find i adjust fully after about a week.
I'd say- don't use up calories on carby foods, you don't get much satisfaction. You could swap the bread in your sandwich for more salad and maybe some chickpeas and the banana for some frozen berries and yogurt, some veg like spinach or an apple with your eggs. I used to make all-lentil flatbreads to use like wraps or chapattis (assemble when needed if using for a wrap)- cam't remember the exact calorie count but they had more protein than bread and high fibre.
If you only have time for a bought sandwich then egg and cress is usually the lowest cal.
Frozen spinach is a godsend. It lets you really increase the bulk of whatever you cook with negligible cals and a nice savoury background flavour so very satisfying. Just adjust the flavours/ garlic to accommodate the extra amount of dish.
Decide when you need your main meal of the day to be and make the most of that, saving elsewhere. If skipping breakfast works for you then it allows you to have 2 quite substantial meals later.
Shiritaki noodles are a fabulous diet food. If you've not tried them they are very low calorie noodles made of konjac root. Serve in a sauce not as a bed as they need a lot of flavour. Sesame sauce and veg or in a bolognese type veggie bake with low fat cheese is my favourite
Drink 2l of water or herbal tea a day.
I find I need fats around my period- include healthy ones like dark choc, nuts, tahini dressing or nut butter.
If you're really struggling it may be worth setting your limit a bit higher and sticking to it rather than being miserable on 1200. You can always reduce it. There's a noticeable difference between 1200 and 1400 in terms of food and you'll still lose weight.
I did old weightwatchers years ago (my weight fluctuates a lot due to medication). I think my points limit worked out at about 1350 cals or so and allowed unlimited non- starchy veg and certain other things- egg whites, not sure what else. This was really effective too so could be worth trying that way.
Weight training is fantastic, I just love it. I'm quite a stocky bugger by nature so it doesn't make me slender and lithe but the difference in strength, capability and definition is such a confidence boost