Honestly, I wouldn't bother either the doctor or with the tamiflu. They've proven it honestly doesn't do much......viruses are evolving and it isn't. Know what I mean?? Unless you really can't cough the stuff up or are having an unusually high temp you can't get under control or have the symptoms of dehydration, stay clear of the doctor/ER.
Why? (because going to the doctor sounds reasonable) Because not only are you going to expose every patient in the waiting room with the flu, but you're going to expose yourself in a weakened immune condition to everything anyone else in that waiting room has that has brought them in to see the doctor. Not a good idea. It increases your chances for a secondary infection, not good.
Stay in bed, take plenty of naps. Drink plenty of water, not just fluids, water. Eat something each meal even though you might not be hungry. (body needs the fuel to do it's job) Nap. Fluids. Nap. Yes, I know I'm repeating myself. That is how important it is.
The biggest thing they don't tell you about the flu shot is........it's a crapshoot. They pick what they think has a high chance of being the most popular one, trouble is they're usually wrong and it's some other strand. Not to mention........there are a wide variety of flu viruses out there at any given time. And even if the shot contained the strain you caught, doesn't mean you can't catch it. Vaccines don't always work as well as they're supposed to. Even though I got a shot this year, I stay away from anyone with cold symptoms.....or who even looks like they *might* be coming down with something.
I hope you feel better soon.
((hugs))