anxiety attack?

[c2q]

Yesterday and today have been rough. I have been taking buproprion since April 11, and really think/thought it was helping with my quit. This is day 8 for me! Several days ago my heart begin to feel like it was pounding, and I felt like I was having an anxiety attack. I thought it was just part of the quit for me - I had an panic attack after my first 3 hours of quitting. Since last night, the pounding heart has been virtually constant, and I'm a little scared.

I cut my dose in half today, and will talk to my doctor tomorrow. Any one have any experiences llike this? I feel like I'm could start hyperventilating any minute. I did talk to my pharmicist, and she didn't seem overly concerned.  I think I'm just looking for a some reassurance.