Having concerns with tamiflu.. read details?

I have the regular flu so i was prescribed tamiflu for 5 days twice a day. Its only the second day ive been taking it and i find my cough hasnt gotten any better, i have alot of phlegm, bright green snot, irratibility/mood swings, and very hoarse throat. I was wondering if this is becuase of the flu itslef or if this is side effects of the tami flu? Im also curious to know your opinions of tami flu because ive read online that many people are against it. Thanks so much!