I think my initial posting just got lost (!). I apologize if thi...

I think my initial posting just got lost (!). I apologize if this ends up to be a repeat. I was taking Guaifenex 600 mg 2 times a day for about 4 weeks for sinus troubles and then began to notice heart palpitations any time I did anything active. After about 5 days of this, I finally realized it must be the medication and I stopped it. Now it has been a week exactly since my last pill. THe strong palpitations have stopped (that took about 5 days to end) but I still don't feel right - there is a heaviness in my chest and sometimes my heart seems to beat erratically, although I am having no more strong palpitations. My doctor and pharmacist both say that I should feel fine now but does anyone have any personal experience with side effects lasting a week or longer after discontinuing this drug?