Incoming long post! With apologies if I'm repeating anyone else, but it's easier just to work through each post separately:
@BountyMultipack yes you can - and should! - add garlic and ginger to your curry. Also, you can use shallots in place of onion, as they're much lower in carbs (3.3g per 100g, compared with 7.9g for onions). But use the echalion (or banana) shallots, as they're bigger and much easier to peel. As @Jollyholibobs says, though, if you don't have shallots then I'd still use onion - it's a pretty vital component in most curries. Most dishes I cook, actually!
Fresh mint (and any other fresh herb) is totally fine.
@Lalalalalaaaa a 150g pot of Total 5% is 4.5g carbs, so don't worry about that! It's fine. Not being as full also indicates that adding more fat (like cream/clotted cream) would be helpful, if you can't find a 10% fat yoghurt.
@DontGetEvenGetEverything I'm sorry you're sad - that must be really hard too 
. But don't let emotions fool you into eating the wrong thing. How would adding an artificial chemical into your food really help? (I know that's a very rational response to a very emotional situation!). We are aiming, in this short period of time, to break the hold that sweet things have over us generally - but also to identify occasions when we're at danger of giving into sweet cravings.
Don't get me wrong - I really understand how much our emotions control what we put in our mouth. If dieting was black and white and just a rational thing, none of would be overweight.
You've identified a trigger, so now you need a strategy for coping with it in the future.
(One crumb of reassurance I can offer you, is that your tastebuds will change - you'll wonder why you thought yoghurt needed to be sweetened!)
@Jenasaurus alcohol will be allowed after the first couple of weeks, so yes! How long are you going for? If it's just for one night, then I wouldn't worry too much about it, but if it's for a long weekend, or a week, then you will need to be careful about how much booze you're drinking. Things to avoid, for sure, are beer, lager, cider and cocktails. Stick to dry wine and/or clear spirits with a low calorie mixer. And try and moderate it as much as you can.
@Nugg I share your concern, having read that menu! Unfortunately it's always a risk that you take when eating out, and all you can do is to navigate as much as you can. Keep your carbs as low as possible for the rest of the day/the next day and - perhaps most importantly - just enjoy the occasion for what it is.
@JustAPony every time you look at those chocolates, just think about that 5lb loss! The only thing you can guarantee if you give in is that you'll wipe that loss out.
@BountyMultipack You're worrying about 0.4kg?! Honestly, your body's natural daily fluctuations could account for that. If you are going to get upset this way, then please don't weigh daily. It will only undermine your motivation. @NotDonna has it absolutely right - celebrate your achievement! And @StuntNun's graph is a very good way of seeing how we can expect weight loss to pan out.
@NotDonna what time do you want to come round? 