To remedy post-winter blues/flu-like symptoms, we have the solution: chocolate! No need to explain all its benefits and so on... we know it will do you good and that's the main thing :-D!
And since today is a holiday (and besides, Easter is kind of like a chocolate celebration, so let's pretend that...), you have a great excuse to do nothing. So, stay warm at home in your high socks, make yourself a cup of tea (or even a hot toddy if necessary...) and have a slice of chocolate-mango cake. You'll see, it's super cool ;-).