Hello~It could be due to stress, or even some pinched nerves, perhaps seeing an osteopath, massage therapist or even a chiropractor wouldbe of some help. If the twitches are due to a pinched nerve, any of the above methods can help.
Hey, sorry this is going on. I'm glad you are working with your doctors even though it is frustrating to not have an answer. You feel this is getting worse? When you say fasciculation, do you mean like twitching? I have this occasionally two. My doctor has indicated that this can happen due to stress or if I have too much caffeine. It's disconcerting when it happens but they've assured me it is harmless. But I don't know if that is what you are talking about. And now it has advanced into an involuntary movement of your hand? Where are the pulses? I will say that I don't normally see the pulsing I feel. You see yours?
This link may be helpful for you. It talks about benign fasciculation syndrome. https://www.healthline.com/health/benign-fasciculation-syndrome#symptoms It does discuss how many people think that their pulses/twitches are related to ALS or other neurological issues but that there is a difference in that those who have ALS will have other issues that are quite noticeable. These are things like trouble walking, swallowing, gripping things.
They give reasons for the twitches such as my doctor told me of anxiety and stress, trauma as well as some other things. And they are often linked with GI issues like heartburn or IBS.
Tell me more about the new development though. The involuntary movement of your hand.