I have had a cold the last few days now I'm getting really bad headaches is this sinusitis????

Possible sinusitis. A viral upper respiratory infection can be a predecessor to an acute sinus infection. Sinusitis generally presents with facial pain, upper dental pain, anterior or posterior discolored nasal drainage, and often sore throat. Band like headaches over the forehead and temples are more likely due to muscle tension.
Could be. Try a decongestant for a few days and if continues see you MD. You can also try a nasal flush with saline. Kits are OTC at you drug store.