Does anyone else get this? It's very hard to explain, but it feels like my insides are vibrating, deep inside my stomach and chest. It feels like there's so much going on in there and I feel like my body is throbbing and shaking from it....but it isn't....and it also feels like my heart is going crazy, but when I take my pulse, it's normal. It's kind of like having a terrible pounding headache inside my torso...like I said, it's very weird and hard to explain. I wonder if it has something to do with tight muscles. Anyway, I wanted to know if anyone else experiences this....it's scary and always makes me worried that there's something terrible wrong with me.