I get the same tightness in my core and around the bottom of my rib cage. Feels like I can’t get a deep breath. I also get it in my shoulders at times. I have a sense of vibrating internally as well. I’ve seen so many specialists and ruled out Stroke, MS, Parkinsons, GBS, Transverse Myelitis etc. I’m now scheduled to be tested for SFN and Dysautonomia. It’s horrible at times. Hugs and prayers 🙏🏼