Do you think i have the flu? i'm not vomiting and i don't have diarreaah or but i have a sinus headache kinda and a stomach ache not bad

Not flu: Influenza (the flu) is a respiratory disease - runny nose and cough with fever and body aches including headache. If it just started and you get the runny nose, fever, and cough with a day, then it might be influenza. However, there are many other viral infections with other symptoms that you could have - most are not as severe as influenza.

Stomach ache: Do you have a fever? This would be an important flu sign. I do not know how long your symptoms have been,but they can be the result of multiple things including simple head congestion. I would start with a decongestant and motrin. If your symptoms do not improve in a a day or two or you do get a fever then get checked.