Sorry to hear you are so sick. My kids were sick all last week, same symptoms. Pediatrician said it is the flu. She prescribed Tamiflu for them. If you have the flu it shortens the time of the flu. If you are exposed to someone with the flu it can help to avoid you getting it. She said there are very good results with it for kids and adults . Most people feeling better after 24 hours. It worked well for my kids.
Go see your doctor, drinks lots of fluids and rest, rest, rest!
Get well soon.