Yesterday morning all of a sudden I started sneezing out of no where. As the day progressed , it got worse as my nose started to run and my eyes watered constantly. Eventually by the night my head was throbbing. I took Benadryl but it didn't help. I woke up this morning with a busting headache, my lower left side of my back sore when I move, and my eyes hurt to hold them open. Is this just a cold or allergies? Should I see a doctor or give it a few days to see if it'll get better?