I've had it GG, and it's extremely unpleasant. The problem is that, after I thought I'd finally recovered from it (five weeks later from the beginning), it's coming back again. Not as severe, but quite a bad one. You'll no doubt start feeling very tired because it seems to knock all the stuffing out of you. As you say, it's almost 'flu, but as it's still possible to get on your feet it's obviously "just" a cold. I've only ever had 'flu once, and I couldn't get out of bed for a few days, and was in so much pain I couldn't do anything. Anybody who is upright and walking about while telling you that they have 'flu are very much mistaken.
Chin up, it DOES get better gradually, a day at a time, but it is frustrating when you can't get to do the things that need to be done. Look on it as an enforced rest.