I definitely don't have the part pre-medications, and I have the caffeine jitters only sometimes - less than once a week. I'm taking concerta for reference.

I'm very curious about the pre-medication jitters. It feels to me more like anxiety/anticipation than a symptom of medication. What happens if you delay taking medications after you start thinking about it? What do you associate with taking medications? Do you start working or "being in focused mode" right away? I tend to get more jitters if I "need" my meds to be effective soon vs having a bit more time for them to activate fully.