I didn't do much but sleep for two months after getting back on the pharma-go-round after a couple of decades off of it. My psychiatrist refused to take my reports seriously and kept finding other things to blame. (And to be fair, there's a LOT going on right now.) So I stopped le stimulant... and have had a grand total of two naps in as many weeks. I'm still exhausted all the time, but at least I can stay awake. I'm also not nearly as irritable.
First time on meds, I had the feeling that someone was behind my back pushing me gently and helping me when doing move like getting out of my chair.
It was very disturbing as it now required very low effort for me to physically move when needed, while it was really difficult for me to do this.
It was also during the first week that I wanted to cry because I was feeling so much in control of myself, of my feelings and able to stand correctly under pressure without crumbling.
It's 1 year and a half now, and thinking about going without ritalin is just scary.