Are these symptoms of toothache fever pain from head to neck nasty taste in my mouth don't feel good

Probably not but.... If a tooth is causing fever, pain from head down to your neck and a nasty taste, its gotta be one badass toothache. You would probably know already if the tooth is causing this problem. Please get it looked at soon!
Could be. To know for sure, you need to be examined locally by a dentist. Please call for an appointment.
Usually . Usually if the pain is from a toothache, then one area of your mouth will be very painful, and you may have redness or swelling. As you have a headache and fever, you should have a medical evaluation. Be sure to tell your doctor any medications or herbs you are taking. If you have a rash or vomiting then you should be seen as an emergency.