Oh OP my heart feels for you.
I hope you're busy and haven't decided to not come back and respond.
I've had numerous issues with food throughout my life and I was 15/15.5st for years after my DD came along in 2018 (5'5 for some visual. I wore 18/20).
I remember my mum telling me when I was a teenager that weight is so much harder to get off when you get older because I used to eat so many packets of crisps a day. I was more savoury back then whereas I have such a terrible sweet tooth these days.
I've always had a bad relationship with food though (still have 🙄 I'm 48).
I think to get some control and hopefully help make you feel better (because you're enforcing the control) you could start small.
Stop eating the left overs!
If you can't just throw them away to the bin/recycling; tip something on them so they're inedible.
Sounds silly but I did it many many moons ago and there was no way I was going to eat something that had coffee/tea, squash/juice, tomatoes (anything I didn't like to eat) or condiments on it.
Put all the leftovers on one plate and contaminate it so it HAS to be thrown away.
Even if you just made that change, it's a start and hopefully you'll start feeling a bit better about things.
Stop saying that you want to lose weight. People can't throw that in your face then.
If you eat a bar of chocolate, pizza, biscuits/cheese whatever, don't guilt yourself and say I wish I hadn't have done that. You did it because you wanted to (or couldn't help it) so you may as well enjoy it, or don't do it lol
Cut the portion sizes down babe.
There's no reason why you can't downsize portions and snack healthily if you have to. There are many 'treats' you can choose from, it doesn't have to be boring but it doesn't have to be bad/sweet stuff either
Increase your protein intake.
Keeps you fuller and there's so much higher protein products available in all the shops.
In an ideal world you'd cut out the secret eating altogether but I know that can be difficult.
The question is, why do you secretly eat?
Is it because you know that your family won't approve?
Is pizza your go to thing or do you secret snack other things too?
Are you depressed? If so, so you realise why you're depressed?
Would you be up for joining a group like Slimming World?
Someone I know does something called RH (I don't actually know anything about it) and shes done well.
Of course there are the injections but side effects would concern me personally. I know people who are doing extremely well with them and some who didn't have such a good experience but it's the same with anything.
How many people have Botox? I know one person who had an awful experience with the reaction and was in the Nationals about it and the bad side effects of treatment.
The bottom line is you HAVE to have more control.
We have choices for everything.
Make better ones for you and think about how many more years you'd like to have with your family.
Maybe think about how it would look at your funeral..? Harsh but its a reality for all of us. We're all going to snuff it, it's just a matter of when and why and how....
I feel bad for you and hope you find anything that I've suggested helpful.
Good luck x