With cold symptoms, the nose teems with watery nasal secretions for the first few days. Later, these become thicker and darker. Dark mucus is natural and does not usually mean you have developed a bacterial infection, such as a sinus infection. Flu symptoms are usually more severe than cold symptoms and come on quickly. Symptoms of flu include sore throat, fever, headache, muscle aches and soreness, congestion, and cough. Swine flu in particular is also associated with vomiting and diarrhea.
With the flu you could have nausea and run a bit of a higher fever. I just got over it and at first I thought it was just a cold since it was cold like symptoms. Go to the Dr. just to be sure. They will give you Tamiflu if you have it. If you go within 2 days of symptoms ( if it is the flu ) the Tamiflu will shorten it.
Also I would get very dizzy when I stood up and walked around, Lots of Nausea. and just very weak and shaky.