I’m not 100% convinced I’m ADD, but without a doubt I’m a Highly Sensitive Person. Not only do large changes upset me, but small ones also. Recently my parents were coming to visit me and my son in the hospital (he’s inpatient right now) and they changed their arrival time by an hour, to stop and get breakfast with my other son. This one hour change had me reeling with anxiety. A few years ago, before I had insight into my own emotions I would likely have gotten upset with them. Although still upsetting to me, I was able to put it in perspective and not get angry with them. Had I not understood my own self this one tiny change could have ruined the entire day, instead it took me about 45 min of meditation to get back to my normal. Good Luck, but know you are not alone.