The anxiety showed itself at bedtime today.  Joey had had a goo evening, coming back from the movies with Anne and Izzy at about 2000.  Whilst Anne was upstairs with Izzy, I made a deal with Joey that he could watch 15 minutes of Youtube if he then went upstairs with no problems and was good at getting into bed.  I gave him warnings and then told him that the 15 mins was up.  Tantrum due to the fact that towards the end the screen had frozen a  few times.  Faces, scowls, etc etc.  sadly I lost my temper a little as well.  Not a satisfactory end to the evening.