I also have a huge fear of schizphrenia. Dont be alarmed though because it is anxiety and with anxiety usually you have some ocd which I do.When you fear something you cant help but think about it constantly.The sinus thing was just the catalyst for your anxiety.
The sinus issue? Could be anything from a sinus infection? Down to a deviated septum, which is a narrow passage way within your sinus.
Schizophrenia? Is a scarey thing to think about. But do not let the 'fear' run your life. My mother has it. She is on a lot of medication for it.
I'd say go to a dr, and talk to them about your concerns. If you are an outgoing person? Don't let this fear control your life.
As Lynminx states ...talk to your doctor about your symtoms .
Did a doctor check out your sinus headaches? If not get it check out. Serious headaches with side effects should be looked into.
Good luck
Sinus headaches are not a symptom of schizophrenic. I don't see why he would have mentioned that in the first place. If this started with the headache, you need to find the cause of them. It could be as simple as allergies.
You need to take a few deep breathes to calm your self. My mom gets paranoid when she gets a cough or flu. And she researches all the diseases she could possibly have and then stressed herself out for nothing. This is all this is, paranoia. It's normal, you just have to take hold of it and not let it get any worse. Talk to a doctor or a friend about it.