He's not been right for about a week and thurs and fri he had a virus of some sorts but was also very anxious and emotional, he finally told me today he doesn't want "to see the timer at school".
DS is 6 (eldest in class - year one MS) has ASD, sensory issues, anxiety, etc.
Turns out in school they are using a timer which counts down and at the end "the ballon bursts" (I'm assuming it's sound and picture) "for when they get changed at P.E. time". 
DS is sound sensitive and HATES balloons popping. I can't imagine how anxious a ticking sound leading to a balloon bursting would make him.
Asked a friend with a ds in same class to ask her NT son about it, he has confirmed it and friend is also shocked about it and thinks it's an awful idea.
I cannot believe they thought this would be a good idea and I'm so annoyed for DS. I know there is another child in his class with ASD and dspraxia, and another child with CP - sure they maybe will have a helping hand getting changed but they must feel so anxious - it just seemssuch a negative approach IMO.
AM I over reacting????