It is a struggle and all the feels and so glad you are getting some professional support. I've had weeks recently where I have been crawling the walls for food, any food because I have physically felt so hungry (lower stomach - nothing could touch it) - and thoughts constantly revolved around the next meal. A few times, I made myself go for a walk as a displacement activity and that helped - concentrating on pace, surroundings, weather instead.
I also started to have desserts after meals of a handful of berries (partly to increase fruit intake responsibly) with full fat natural greek yoghurt (about 70g) so that chimes with what
@Inka said.
I too have been self-sabotaging by rationalising eating carby food and so on, as I was doing a lot of 'activity'. It's messed with my readings over several days after and I realised that some of it is just not worth the effort of eating it. Not buying them in the first place is still a work in progress!
The key thing for your sugars is trying to keep what excess you are eating low carb - so you could dodge the cereal trap by having an egg with mayonnaise or something like that. If you know that any excess snacking isn't going to spike you, it may help curb the anxiety and guilt.
Luckily the extreme hunger phase passed for me (part of it was a stress response), and I hope yours does too.
You can totally do this, just take it one day at a time and keep posting - good, bad or indifferent - we're all or have all been on this particular journey.