Hi, I have had all of your symptoms. The sharp pain in my head in the same spot, floaters (which have nothing to do with your brain... it's tissue floating in your eye and your retina sees the shadow), light sensitivity (which also isn't related to the brain), brain fog, and nausea. I have had so many other symptoms that you wouldn't believe, but apparently I am fine. I had an MRI of my brain and went to the eye doctors multiple times.
Just so you know, when you go to the eye doctor's and they dilate your eyes and look behind them with that bright light, they see all those nerves behind your eyes and floaters, as well. When you have a brain tumor, those nerves swell due to the increased pressure in your skull caused by the tumor. I wouldn't worry too much, but if this really bothers you and disturbs your life, just go to the doctor's.