I suddenly feel that I can't breathe normally, can't catch my breath and my heartbeats are so fast.. this lasts for a minute but sometimes it lasts for more than 15 mins., also my head is so crowded with thoughts can't think of one thing alone i feel so anxious. 9 month ago i had the same symptoms went to a doctor and he prediscribed "buspar" as the medication i took it for a couple of months and i felt better, but when i take it now i feel no difference.