I guess my first thing is to address your comment that you feel like an awful Mum because your son is your source of anxiety . . . first, I do not think your son is your * source * of anxiety. I think that your anxiety needs a focal point and that is your son . . . because you are scanning for the thing which gives you headaches, it appears that you have projected that on to your son and are forever scanning for things that will give * him * a headache, according to your post . . . if you are concerned that a lollipop is too much sugar, it is within your control to give him something else . . . there are healthy "sweet" treats such as apple slices and if he really really wants something that is sugar, then try something that is controllable like one very very small mint . . . . although many believe that we are genetically programmed to store up carbos, a lot of our need for sugar is through habit so now is your opportunity to instill your son with good eating habits so long as you model them also . . .
You are not an awful Mum . . . you have recognized your issue and you are seeking help . . . an awful Mum would not do that . . . .she would just continue entrenching herself in her anxiety and perhaps causing long term harm to her son . . . you are not doing that . . . you are showing the strength to re-engage in the process of recovery and, yes, you are a good Mum . . . so don't feel guilty . . . . be the best Mum to your son without projecting your anxieties into his world and that you know you can do . . .
I have had a lot of success with CBT and yes, because you are on holidays, this may be an issue . . . you have no distraction other than your son . . . so, follow through with the CBT, redirect your focus from your son (re: anxiety), and enjoy the time with him . . . yep, difficult to do, but you can do it . . . if and when you can, let us know how you are doing . . . .take care, KC