Congratulations on 6 weeks, I am almost half way there, thanks for warning me about the cravings, it's been plain sailing pretty much so far.

Totally normal. Don't fret, it will happen, your brain is starved from a very powerful drug it has depended on for a long time. Do not let that junky part of your brain rule you or disrupt your recovery. You're in charge. Make a list of why you quit smoking in the first place, remind yourself by re-reading all the material suggested on here. You need to re-train your brain and like everything in life, practice makes perfect. And of course ask for help like you did.