Why Would My Cat Sneeze Blood?

My cat is 16 years old. She has been sneezing, eyes's watering, nose running, since fall.
In the past 2 months she has had a puff spot come up on her face just above her nose and left eye. It goes down after a few days then when she starts sneezing again it comes back. Today she has sneezed up blood three time in 30 min.  Is this allergies or does she have a more serious problem. She has stopped eating her dry cat food about 6 months ago and will only eat canned food. I give her small amounts at a time so she will not throw it up.

Her eyesight could be failing, and she could have some sort of infection in her lungs, you should take her to the veterinarian. Hope this helps.