Hello
Sounds like you did have Influenza with the high fever. Sometimes, secondary bacterial infections can result from viral infections can result from Influenza such as Pneumonia or Bronchitis. Your dry cough that produces a dark colored sputum is indicative of such. Also, your throat being sore is most likely from the bacteria in your upper respiratory system that is still present...or something altogether different like a Strep infection or even Mono.
Most likely you are going to need antibiotics and a steriod injection to help clear your airway and bring relief to your throat. The steriod injection will help with the throat pain and also give you some energy.
Your Dr might also prescribe something called Magic Mouthwash for you to swish and swallow. This concoction contains a mixture of Maalox, Benedryl, and Viscous Xylocaine. Since it contains the Xylocaine, it is prescription only but it will bring immediate relief to your throat.
Expect a chest xray when you go and also possibly some blood to be drawn so the Dr can see what your white blood cell count looks like.
Sounds like you have exhausted all means of 'at home' measure, so, it is most likely time to let your Dr take a look. If you don't have a regular Dr, you can always use a walk in clinic or urgent care. They will be happy to treat you.
Hope you feel better soon!
********************
PLEASE NOTE: The $$$ that you have put down as a deposit will not go to me until you click "ACCEPT" after reading your answer. Otherwise, it will be held by JustAnswer.com and I will not receive credit for my time and efforts.
Please ask for clarification if needed.
Nurse
17 years exp. in all areas of nursing including emergency medicine, hospital, and private practice.