For the past two days, I've been suffering nausea and a minor, sometime severe, headache. No fever. Could it be the flu?

Flu. It is possible can be the flu, even without upper respiratory symptoms and/or fever. Flu can work in many ways, so be on the lookout for any fever or the start of any cold like symptoms.
Possibly. According to Mayo Clinic Flu sxs may include “Fever over 100F (38C), Aching muscles, especially in your back, arms and legs, Chills & sweats, Headache, Dry Cough, Fatigue and weakness, Nasal Congestion.” Gastroenteritis symptoms may include: diarrhea , nausea, vomiting, abdominal cramps/pain, headaches, muscular aches & pains as well as fever (low grade). Bloody stools are not usually associated.

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3x have had what it like the start of the flu but hasn't turned into anything. Grazed feeling inside allover and severe headache. What could it be?

See a doc. if you have never had a headache like this then go to a doc asap. new headaches are not ok until checked out especially when they are accompanied by medical symptoms. Read more...

Is it possible for the flu to cause a severe headache? It's probably the worst I've ever had and it's causing my eyes to hurt too. It started yesterday

Yes. It is possible for a flu to exacerbate headaches particularly as it seems you are prone to headaches. You want to make certain that it is the flu that you are dealing with, and if you are having the typical flu-like symptoms, that is probably the case. There are other things that can cause your symptoms like meningitis or a cerebral aneurysm. Consult your doctor if this doesn't improve. Read more...

I feel warm but have body temp of 96.2, haven't slept much due to congestion/runny nose and severe headache. Is this the flu or cold?

Does not. sound like influenza, without high fevers or GI symptoms. Most likely a viral illness. If it persists for more than a week or so, see a doctor for proper treatment. Read more...

My wife is just coming out of the flu symptoms with severe headaches and her right ear is popping with clear fluid discharging?

Needs to be seen. It looks like your wife needs to be examined by a physician as soon as possible. If she has high fever, confusion or neck stiffness she probably needs to be seen immediately. Read more...