Constant Leg Twitching - Need Help!

Hey guys, I’ve had a symptom that’s been scaring me and was wondering if y’all have experienced this. When overstimulated or generally upset, I will have a full-body/torso reaction where all my muscle seize up and I twitch (often with my head going to the side). I have no control over this and have wondered if it’s a mentally linked thing. Like I’ve suppressed stimming for 25 years and this is my body’s response? I don’t know. It honestly just scares and hurts me and I want to figure out what it is and how to stop it.

Shaking Leg When Worked Up

Here's a weird one so I get these random moments where my joints will randomly cause me extreme pain usually my knees wrists or hips like ill be walking just fine then take a step and boom I'm on the floor cause it just decided to stop working properly and be painfully whenever I put weight on it? I don't think it's pinched nerves cause usually shaking my leg or manipulating the area it will suddenly stop hurting so if anyone might have an idea what this is I'm open for it!