My difficult child was diagnosed ADHD/ODD a couple of years ago. We went through the gamut of medications for this, until finally using daytrana patch, 10 mg, the lowest dose, which works extremely well for the focus/impulsiveness, but is wreaking havoc with her appetite. For this reason, I do have an appointment. set up with her psychiatrist for a complete physical/testing to rule out anything physical. Last week, she started this new, strange behaviour. She is feeling her heartbeat, running and hiding and jumping, and feeling it again to make sure it's still 'working'. And, in the meantime, as she is doing this, she is telling me she is having a hard time breathing. Not sure if it's anxiety or what. My heart is breaking watching her go through this routine, which she is driven to do. She knows when we talk about it that she is o.k. but can't seem to control her actions. This was done off and on all day yesterday, to the conclusion of not enjoying her day off from school. Anyone ever hear of developing this type of behaviour, and so quickly?