Well, if the cyst is large enough to clog up your nose, yes it's related to your symptoms. Also, you could have an infection in your sinus cavities, which would cause swelling and inflammation, which would give you your symptoms. Go see an ear nose throat ENT doc and have him check and see if you have stopped-up nasal cavities, and an infection in there, and if the cyst is interfering with normal drainage of the nose fluids.
the emergency doc who gave me a CT scan did refer to my cyst as being "large" but i havent had any colds or stuffy nose or mucus drainage so i really dont know if my cyst is related to the head aches and dizzines.... and pain behind the eyes? its strange but i actually have eyebrow pain.