Biaxin and azithromycin

I was prescribed Biaxin 500 mg, for bronchitis, to be taken twice a day on 2/26/08. It is now 2/29/08 and I have not had relief from a massive headache which occurred within 2 hours of taking my first dose of Biaxin. And even worse, I still do not have any relief from my original illness. I have had bronchitis many times before and have always been prescribed Azithromycin, which cleared up my infection and I started feeling at least a bit of improvement within 24 hours. Along with the severe headache I am experiencing a bad taste in my mouth that won't go away, as well as sleeplessness, tremors and numbness in my extremities.