I got flu at the start of january and had tamiflu. i got better from the flu but since then i continue to have a cold. why can i not recover?

Not all colds are: classic influenza. Your immune system may be low and it is worth a visit to your PCP for routine blood testing.

Rest & diet: Get adequate daily rest and fluids (water & juice) & a good diet consisting of a lot of fruit & veggies & do not drink alcohol, smoke or use illicit drugs. And take a multivitamin & extra vitamin C supplement daily. Garlic supplements may also help. To make certain you do not have a lingering serious infection in your lungs or elsewhere please go to a clinic for a general exam!