I have started to feel that exact same way for about 2 weeks now and I am completely freaking out.. I always did feel like I might have just been sensitive to earthquakes when they happen and some were actually somewhat relatively close enough for me to actually get at least an Aftershock affect, but lately I started to notice that I can be sitting, or taking a shower or the worst one is bending over and I feel as if I was in an elevator that Happen to be on the ground then rapidly shoots itself up faster than an elevator should even be, and then dropping back down and since it would be going so fast it feels like as if I were getting a strong and immense pressure pushing me down and then I start to get freaked out trying to figure out if it's an earthquake and if my 2 baby girls are scared or ok.. only to find out that there was no earthquake whatsoever..