I am having what feels like severe anxiety. I have had chest pains, bad headaches on my right side, a choking feeling like I can't breathe, and just this very anxious, jittery, nervous-like feeling. I am also having a hard time focusing my mind. I can't seem to concentrate, can't follow through with a thought, and I just feel nervous and anxious. I am also sleeping VERY lightly and once I wake up for any reason, I can't seem to go back to sleep.