I am currently having flu-like symptoms but not sure if it is only sinusitis. my ears, tongue and pallet itches a lot, runny nose and itchy throat?

May be allergies: This doesn't sound like flu (think high fever, sore throat, achey all over,cough,exhaustion). It doesn't even sound like sinusitis. What it sounds like is allergies, likely to airborne pollens, molds and/or dust. But itchy throat/pallet also often caused by certain foods. Try antihistamines to see if they help. Then see a Dr. to see if you can find what you are allergic too and try to avoid it.