Morning, Rachel! Welcome back to the plan. Firstly, it's great that you're seeing your gain as motivation to get back on track.
You may wish to start your own thread in the Dieting Journals subforum HERE
Regarding syns, it's absolutely important to have them! As SW says, they're there for you to enjoy. You can spend them on anything you want! Don't deprive yourself if there's something you really want, because it can lead to unhealthy habits and won't do much to improve your relationship with food.
However, there are 'healthy' syns you can have if you're able to stay away from those Curly Wurlys (which are 6syns for the 28g bar, by the way!). Things like dried fruit, nuts, seeds etc are all great. Nutribombz, which a lot of people talk about on Instagram, also seem to be really great--fairly low in syns but full of good stuff, and they still taste naughty!
You can also find lots of recipes for low-syn substitutes for high-syn treats online, such as the SW Ferrero Rocher (which I've made and can tell you that the flavour is very similar). That can be found just by Googling. You've also got the SW lemon drizzle cake recipe available online.