Omg, how can anyone find this thread helpful. OP has literally been bamboozled with 20 different pieces of advice, often contradicting each other.
You need to work WITH your body, not against it. You are starving yourself, and your body is rebelling. Stop trying to force this or that on yourself, be it yogurt or whatever else.
You have to start with your current natural way of eating. Before you started starving yourself that is. Yes, it's probably quite unhealthy and it's what lead you to being overweight. But it's YOUR starting point. It's what you do naturally, and by making small changes you can gently change that. But it takes time.
So stop dieting, and go back to eating what you were naturally eating before. Track everything. You can use an app, paper diary, up to you. Then after a week or two have a look at what you're eating. What jumps out at you that's probably not helping with weight loss? There will probably be a few things. Pick the one that is the easiest to tackle.
Say you eat 3 packets of crisps every day. Over the next week, pick 3 days where you'll only eat 2. Pick the times you won't miss them. Make a note if you achieved your goal that week. If you've been sticking to it, move to the next step - 2 packets every day. And so on, and so on. Build on the success you've made ONE SMALL STEP AT A TIME.
You don't even have to cut out crisps completely, just go down to a level that you're comfortable with and won't feel deprived and have an urge to binge. If it's a packet of crisps 4 times a week, that's fine.
Obviously crisps is just an example. It can be anything - Biscuits, sugar in coffee, Fizzy drinks, too much bread, etc. Pick the easiest thing and go from there.
While you're tracking your eating for that first week though, I would work on sorting out your sleep. That alone will have huge impact on your hunger and energy levels. Your body is in constant state of stress, so will be clinging onto every ounce of fat there is.