Five years ago, during my pregnancy, I felt the exact same way as you do. Up until that point, I had been having occasional panic attacks for 2 years. I felt so shaky all the time during my first trimester. I gained 15 lbs. b/c I was eating all the time. It constantly felt like my blood Sugar was dropping. Didn't have the same problem with my second pregnancy, though. I also started working out during my 2nd pregnancy.