First of all, well done you on 6 weeks of keto! It's a big diet change and managing 6 weeks is a great start. Even if your weight loss is slow, it's still a loss! And the fact your blood sugars have come down is excellent progress. You should congratulate yourself on these little victories as it's a step in the right direction. So you've had a slip - you're only human, and I'm sure a lot of us have slips now and again. I know I do! The important thing is that you don't let it become a habit and get back on the horse (so to speak) again afterwards.
With regards to chocolate cravings - I find that a square (or two) of Lindt 90% every day or two really helps. Alternatively, I really like Cadbury Highlights hot chocolate, which is 4g carbs per stick sachet and feels really indulgent with a splash of double cream. I know a lot of people here will use cocoa instead as it's even lower in carbs, but if you're missing the sweetness of chocolate then I find this really helps now and again. I always keep a couple in my cupboard for when I need something sweeter than dark chocolate.
Don't beat yourself up too much, you're doing great.