Hi bex, i only really got the full blown flu, once and it was really bad but only lasted 48 hrs. I think it can make you depressed especially in our situations where we are weak already. Drink loads of water, flush it out.
I remember once, i bought a ticket to a concert that was really expensive but the day of the concert i got a really bad cold, i was sneezing, coughing, sweating, i had sore throat and felt weak, actually this sounds like flu, but anyway, i really didnt want to miss the concert so i drank pint after pint of hot water with pure lemon juice all day, and it cured me. the next day it had gone.