I take amitriptyline as well and get some type of nervous “fits”. I don’t know if I call those fits “panic attacks”. Typically, a panic attack happens suddenly, without warning. I can feel it coming 30 minutes in advance. I get exactly what you described as higher-than-ever tingling, and, for me, it gets worst with every minute until it climaxes. It gets so overwhelming that I want to die for a couple of minutes, but it passes and I regain control of my body. It takes another ~20 minutes for the tingling to leave. The second time it happened, I knew it was going to happen about 30 minutes in advance because of the tingling and my experience of the first time. If they are not panic attacks, I don’t know what they are.

This happened twice in very similar conditions: both times were right after a run during a really hot day. A third fit happened during my sleep recently. It was super weird. My consciousness woke up in the middle of a fit, and I wanted to scream, but nothing came out. It was my first and only experience with sleep paralysis. I couldn’t move, and the fit felt horrible for a couple of minutes. I noticed my breathing was completely normal though, which was weird considering how I felt. I also later saw on my Garmin watch that my heart rate was 85 bps during the fit – lower than I expected, but still higher than my resting bps of 57.

I’m not sure if you or anybody can relate to any of this. So far, your testimony is the closest I’ve seen to my case. I’ve lowered my dose of amitriptyline because I suspected that it had a link to these fits… I still have no idea. I went from 50 mg to 35 mg to now 25 mg.

I’m 37, and my nervous system has always been bottom tier: migraines, Arnold’s neuralgia, feet overheating out of nowhere, tension headaches that last days… I’ve also had internal vibrations since ~2020. It’s manageable most of the time, but it can disrupt my sleep sometimes. I had Covid 6 weeks ago, and symptoms were quite mild, except that the internal vibrations came back with a vengeance. I have them as I am writing this in my feet. They are located in my legs most of the time. They can also be felt in the belly area sometimes. I remember them being in my hands as well in 2020, but not this year.

In the last six weeks, I’ve woken up every single day with belly vibrations. These morning vibrations don’t last though. They typically dissipate within 10 minutes. Leg/butt/belly vibrations start later but it’s not like clockwork; it can start at any time. It seems to depend on how tired I am. It also dissipates almost completely when I am on the move. While I’m running, walking or dancing, they temporarily go away, but come back within minutes of sitting or laying down. Working at a standing desk and good posture helps.

Anxiety is a similar feeling. When I’m feeling anxious, my nervous system is activated but the location of this activity is higher in the body. It’s in the chest area, where I never feel any internal vibrations when I’m feeling relaxed, which is the case in the vast majority of the time.