When I overdo it I have described the feelings in my legs as what it feels like when you hit your “crazy bone” in your elbow. I usually say my legs feel “wired” today. And like you, it usually last a couple of days. I can usually deal with it if that is all that is going on. But when I have the incredible fatigue along with that sensation, it really bothers me.
I am very fortunate in that I have very little pain. My pain is basically just my fingers tips feeling like frost bite. When I read what many are going through, I stop my whining.