The fact that you are here, starting a thread about the flu, and using the word "whiny" tells me you are doing ok.
Free flu advice from a retired pediatrician:
Fever with flu typically lasts 3-5 days, most viruses with fever typically 2-3 days. Some respiratory symptoms, especially a dry cough, lots of body aches, usually very little GI symptoms. Tamiflu is rarely offered if you have had illness more than 48 hours, but is given more freely in high risk situations. Pay attention to any chest symptoms, particularly breathing fast. Breathing fast can be subtle, and many people don't notice it. Flu itself is usually self-limited, but can be deadly. It often causes secondary pneumonia.
This year influenza B showed up early, and they're only now starting to see influenza A. Both are in the vaccine. Influenza A is the one that mutates and the one in which the vaccine can "miss". Last year the vaccine was pretty effective. This year we don't really know yet, since there hasn't been much influenza A. The vaccine can reduce the severity of illness, in addition to potentially preventing the disease.
Any older adult with high fever really should try to see a doctor, and consider a visit if a fever lasts more than 48 hours.
As with most viruses, go to bed, try to sleep extra, drink plenty of fluids, but get up every so often and move a little. Avoid going out and giving everyone else the flu, and don't try to do your regular exercise. I have personally found that if I can sleep a lot the first 1-2 days of illness, I recover much faster.
I'm a retired (woo-hoo!) pediatrician, with half of my career as a hospitalist. I've seen more than my share of flu and other respiratory illness, have had pneumonia, and my husband got pneumonia after the flu in 1990. The youngest case of flu I ever saw was in a 3 week old. Baby was hospitalized because we hospitalize all 3 week olds with fever, but did ridiculously well. Gave her Tamiflu.