34 5'3" 130lbs no health problems or significant health history. Last time I went to the ER I was 17 and was diagnosed with a pleurisy while I had varacella. This month before starting my menstrual period I felt a little off from the way I normally do. I gained a lot more water weight and felt a little fuzzy. I got my period two days ago and since then I have been experiencing extreme air hunger with periodic chest pain. Last night I had a nightmare and when I woke up my heart was racing so bad it was scaring me. I think the nightmare was a symptom rather than the cause of what was going on. I took a warm bath which helped a lot and than went back to bed. My blood pressure normally runs low...probably around 110/65 but today it is around 90/50. One last weird symptom, I have been having very very mild involuntary twitching. It feels like my skin is crawling. I never really get sick and haven't been to the ER since I was a little kid. Should I go or can you think of a normal cause?