Hi I came across your post and I have similar issues. Short twitches all over my body but they last <5s and happen 10-20 times a day. Some heaviness in right hand and calf especially after workout. No issues on left side. I also felt slight tremor in my hands and maybe by brain a few times. All in last 5 weeks. Went to neuro but she suggested anxiety as the cause. Not taking any medicine yet. Did the medicines help?
My advice for the ALS scare -
Get some help. Psychotherapy and medications have really helped me get out of this circle; It's dangerous for not only you, but everyone around you as well.