Just getting over the flu. Recommend a way to get over the fatigue?

I've had the flu for the past few days, and I'm just now getting over it. I feel mostly fine other than a lingering cough and the general fatigue that comes with fighting off a disease that saps you this badly. The only problem is that I need to return to work on Monday, and I do semi-strenuous, physical labor as a job (repeated lifting above, below, and at waist level, up to and exceeding 50lbs, etc) and I need to figure out some way to get over the fatigue as best I can in a day or two. My supervisors aren't slave drivers, so I expect them to understand for the most part, but I would like to be able to at least pull my own weight even if I'm not completely back up to speed by that point. That said, can anyone recommend a multivitamin, herb, etc that will help my body recuperate more efficiently so that I'll be able to work in a few days?

Additional Info:

Male, mid-20s, decent physical condition but not ideal, around 6'1" and 185 lbs

Thanks for any advice you can give me!