When my akathisia peaked, I also developed dyskinesia and it's one of the reasons I lost my job because my body would jerk so much, I'd constantly drop whatever was in my hand and was always about to fall over. I worked in a warehouse and couldn't do my job because of this. I was also, literally losing my mind in general and at one point, without realizing I was doing it in the minute, would start hitting myself in the head when an aka wave would get too intense, on top of the dyskinesia and severe sleep deprivation. I wouldn't realize it until someone came up to me and asked me if I was okay. Instead of letting me go home (I worked for Amazon), they moved me to a station where no one could see me because apparently I was scaring people. This was NOT normal behavior for me.
Honestly, being humiliated about people seeing me do that is the biggest reason I never went back to work. Also, every few seconds or minutes, I'd also hear this extremely loud BOOM in my head and my head would jerk down at the same time. It sounded exactly like someone hitting a microphone. This was especially terrifying. I'm so, so sorry you're still dealing with this. The dyskinesia only lasted a few weeks for me. The akathisia, however, persisted for a year after I stopped taking the drug and I still don't feel like I've completely recovered. It's just so mild now, and not constant, that it feels wrong to even complain about what I'm currently experiencing considering how bad it can get. When you talk about shock-like twinge sensations, are you referring to brain zaps? Although I developed akathisia from SSRIs while I was still on the medication (four months in), when I stopped taking it, I had brain zaps for about a month and half. They are very disorienting. How long have you been off it?