I know the people that are reading this are probably thinking WTH.. but to be honest with you I feel it too I felt it for about maybe 4 years now. I did the same thing I had an elderly dachshund that would sleep in my bed next to me and sometimes she would shiver from being cold or from the rain coming and I would always blame it on her but then one day I realized putting my hand on her that it wasn't her shaking it was me. it's so crazy how similar the my experiences to your story. I blamed it on her for the longest time until I actually realized it was I thought it was my back at first and I also too thought it was my stomach.. in at rare time is it is my stomach making really sharp gurgling noises but I can feel those passing through. The vibration seems like it's towards the back of my torso like if it were between the inside of my rib cage and the muscles on my back. I have one particular theory as to maybe why it started. And it started over the situation that involved an incident in 2021. I hope I don't need to say more. It was a situation against my will of sorts. Anyways I did the same thing you did I changed my diet I barely eat anything as it is.. my one rule for eating is if it doesn't look like God made it then I don't need it if it looks like a man manipulated it I don't intake it. But either way I did Google the symptoms it's not great it's very nerve-racking. I'll remember this post that you wrote and if I find any more clues about it or definite information from any doctors that I speak with I'll share it with you I only speak with biomedical doctors by the way I don't do the commercial kind.. I've also thought that maybe it was the increase of Wi-Fi signal that's been being implemented all around us. If you know what I mean