I think all children are different, and CAH children may react differently to under/over suppression.   Our 5.5 year old SWCAH daughter never has tantrums, rarely gets upset or angry and is rather placid.  Her 4 year old and 2 year old sisters (non CAH) are a different story and can behave very erratically at different times.  If anything, our 5.5 year old SWCAH daughter can get quite emotional when she is hungry and a bit of food generally overcomes this behaviour.  As I said, all children behave and react differently to things and it looks like it may be possible for some CAH children to experience behavioural problems when medication levels are a bit off.  Best of luck, I know it must be a challenge for you during this difficult time.